{"title":"Filters","description":"","products":[{"product_id":"celestron-uhc-lpr-filter-1-25","title":"UHC\/LPR Filter - 1.25\"","description":"\u003cp\u003eOur 1-1\/4\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).\u003c\/p\u003e\n\u003cp\u003eThe new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.\u003c\/p\u003e\n\u003cp\u003eIn addition to it's optimum spectral and optical characteristics, the UHC\/LPR filter offers important features that set it apart and result in the highest quality celestial views:\u003c\/p\u003e\n\u003cp\u003eThe multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.\u003c\/p\u003e\n\u003cp\u003eImproved transmission translates to maximum image brightness and contrast. Users of smaller, 4\"-11\" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact.\u003c\/p\u003e\n\u003cp\u003eThe high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC\/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":3737414565928,"sku":"94123","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/24123-125-inch-filter_01_570x380_2x_dfeb873b-57be-4843-8800-81f449d2598f.jpg?v=1543970488"},{"product_id":"celestron-uhc-lpr-filter-2","title":"UHC\/LPR Filter - 2\"","description":"\u003cp\u003eThe Celestron 2\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).\u003c\/p\u003e\n\u003cp\u003eThe new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.\u003c\/p\u003e\n\u003cp\u003eIn addition to it's optimum spectral and optical characteristics, the UHC\/LPR filter offers important features that set it apart and result in the highest quality celestial views:\u003c\/p\u003e\n\u003cp\u003eThe multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.\u003c\/p\u003e\n\u003cp\u003eImproved transmission translates to maximum image brightness and contrast. Users of smaller, 4\"-11\" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact.\u003c\/p\u003e\n\u003cp\u003eThe high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC\/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":3737414598696,"sku":"94124","price":119.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/94124_2-inch_filter_01_570x380_2x_6bc76e61-7231-4e31-a404-63d5431bc54a.jpg?v=1543970511"},{"product_id":"celestron-oxygen-iii-narrowband-filter-1-25","title":"Oxygen III Narrowband Filter - 1.25\"","description":"\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"flex-50\"\u003e\n\u003cdiv class=\"product-detail\"\u003e\n\u003cdiv class=\"product-summary rte\"\u003e\n\u003cul\u003e\n\u003cli\u003eThe 1-1\/4\" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tab-wrapper\"\u003e\n\u003cp\u003eThe 1-1\/4\" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, among other objects.\u003c\/p\u003e\n\u003cp\u003eEach filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":3737414631464,"sku":"93623","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/93623-Narrow_Band_Filter_01_570x380_2x_3b8106ab-95a5-4018-a841-fb37a1f333b2.jpg?v=1518923793"},{"product_id":"celestron-oxygen-iii-narrowband-filter-2","title":"Oxygen III Narrowband Filter - 2\"","description":"\u003cul\u003e\n\u003cli\u003eThe 2\" OIII narrowband filter isolates the two doubly-ionized oxygen lines (496 and 501 nm lines)\u003c\/li\u003e\n\u003cli\u003eFilter has ultra-hard, vacuum-deposited coating\u003c\/li\u003e\n\u003cli\u003eEliminates un-natural colored halos surrounding bright stars\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 2\" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501 nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, among other objects.\u003c\/p\u003e\n\u003cp\u003eEach filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology.\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":3737414664232,"sku":"93624","price":119.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/93624_oxygeniiinarrow_large_1_570x380_2x_e1a0e558-e1b3-44a3-b806-c1da6b75e013.jpg?v=1518923882"},{"product_id":"celestron-light-pollution-imaging-filter-rasa","title":"Light Pollution Imaging Filter, 11\" RASA","description":"\u003cul\u003e\n\u003cli\u003eTake beautiful images of deep-sky objects from light-polluted suburban locations with the Rowe-Ackermann Schmidt Astrograph (RASA) using this all-new light pollution suppression filter designed by Celestron and Astrodon, the leading astroimaging filter company\u003c\/li\u003e\n\u003cli\u003eCustom fit to drop into RASA’s optical window, so you get optimum optical performance even with the addition of the filter\u003c\/li\u003e\n\u003cli\u003eSelectively removes unwanted light pollution while allowing more overall light transmission to pass through to the sensor. Provides over 90% transmission at critical wavelengths.\u003c\/li\u003e\n\u003cli\u003eMaintains a more neutral color balance than other light pollution imaging filters, perfect for imaging colorful nebulae and galaxies\u003c\/li\u003e\n\u003cli\u003eEvery filter is individually tested for light transmission. A graph of test results for your specific filter is included for your reference–a valuable service unique to Astrodon.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eGet the most out of your Celestron Rowe-Ackermann Schmidt Astrograph, even under light-polluted skies, with this Light Pollution Imaging Filter, custom-designed for RASA by Celestron and Astrodon.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eNo matter which camera you use, this filter’s generous 72 mm diameter allows it to easily accommodate today’s largest sensors.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eCelestron’s Optical Design, Enhanced by Astrodon\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eAstrodon, the world’s leading imaging filter company, collaborated with Celestron engineers to create a filter for the Rowe-Ackermann Schmidt Astrograph. The result is the best light pollution suppression filter for astroimaging. The filter replaces a piece of placeholder glass in the optical path, so that RASA’s precise optical path is unaltered.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eRemove Light Pollution While Keeping Your Images Bright\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eLight pollution limits how much of the night sky we can see and photograph. When imaging with a color camera in light polluted areas, skyglow degrades image quality. Light pollution filters help to selectively block light emitted from common streetlights and other ambient lighting. But most light pollution filters greatly compromise the total light throughput, causing dim images, and negatively impact the color balance, causing images to appear too green or blue.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe Light Pollution Imaging Filter for RASA “surgically” removes unwanted light pollution while preserving as much of the useful spectrum as possible. That means you’ll still retain over 90 percent of the light captured by your telescope at many wavelengths.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eUnlike other light pollution suppression filters, the new Celestron LP Imaging Filter for RASA maintains a neutral color balance. Dielectric coatings further enhance light transmission, so you can bring out subtle color in galaxies and other faint deep sky objects. Meanwhile, anti-reflective coatings prevent star halos and minimize internal reflections.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eIndividually Tested for Quality\u003cbr\u003e\u003c\/strong\u003e\u003cspan\u003eEvery Celestron Light Pollution Imaging Filter is tested individually for light transmission. Inside the box, you’ll receive the actual transmission spectrum for your specific filter. Your report is prepared by Astrodon and matched to your filter’s serial number, so you have total confidence in your filter’s performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable class=\"table-open\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear aperture\u003c\/td\u003e\n\u003ctd\u003e68mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eHard coated dielectric and multi-layer antireflection coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField diameter\u003c\/td\u003e\n\u003ctd\u003e72mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter glass\u003c\/td\u003e\n\u003ctd\u003eSchott B270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass thickness\u003c\/td\u003e\n\u003ctd\u003e2.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing\u003c\/td\u003e\n\u003ctd\u003eAndodized aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":3737416466472,"sku":"93617","price":699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/93617_LPIF_Front_570x380_2x_184dfdaa-7d14-4531-bc96-9fe3872fd375.jpg?v=1518921540"},{"product_id":"celestron-light-pollution-imaging-filter-8-rasa","title":"Light Pollution Imaging Filter, 8\" RASA","description":"\u003cul\u003e\n\u003cli\u003eEnhance your 8” Rowe-Ackermann Schmidt Astrograph (RASA) by blocking light pollution, improving image contrast, and darkening the sky background.\u003c\/li\u003e\n\u003cli\u003eThis filter selectively blocks wavelengths of light from sources of light pollution, such as streetlights, not broad regions of the spectrum.\u003c\/li\u003e\n\u003cli\u003eDoes not block wavelengths associated with emission nebulae, keeping your nebula images bright and detailed.\u003c\/li\u003e\n\u003cli\u003eFits into the 8” RASA’s integrated filter mount, maintaining peak optical performance.\u003c\/li\u003e\n\u003cli\u003eOptically flat surfaces free of defects, constructed of Schott glass with anti-reflection coatings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cp\u003eLight pollution in the night sky can significantly degrade contrast in astronomical images. This is especially true when using very fast telescopes like the 8” RASA because the sky background saturates very quickly. The “noise” of the light pollution overwhelms the “signal” from the celestial object you are imaging, making it difficult to get the most detailed image. The Light Pollution Imaging Filter for the 8” RASA remedies this by blocking light pollution while transmitting light from deep-sky objects. The result is bright, detailed objects that pop off the black sky background with superior contrast.\u003c\/p\u003e\n\u003cp\u003eFortunately, many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these wavelengths, the filter greatly reduces the effects of light pollution without degrading overall image quality.\u003c\/p\u003e\n\u003cp\u003eThe Light Pollution Imaging (LPI) Filter for the 8” RASA blocks light from some of the most common sources of light pollution between 400-700nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapor streetlights, mercury-vapor streetlights, and natural airglow caused by oxygen in the atmosphere. Unlike some light pollution filters, the LPI filter blocks only specific areas of the spectrum instead of wide regions. This helps to maintain image brightness and color balance. In addition, specific wavelengths associated with emission nebulae, such as H-α(656nm), H-β (486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects.\u003c\/p\u003e\n\u003cp\u003eThe filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window normally mounts. By removing the clear window and replacing it with the filter, optical performance for the entire system is maintained.\u003c\/p\u003e\n\u003cp\u003eEach filter comes with a plastic storage case to safely store the filter or the placeholder glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003ctbody id=\"spec-block-1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eSchott B270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass thickness\u003c\/td\u003e\n\u003ctd\u003e1.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter diameter\u003c\/td\u003e\n\u003ctd\u003e46 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear aperture\u003c\/td\u003e\n\u003ctd\u003e43 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eDichroic, multi-layer anti-reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing\u003c\/td\u003e\n\u003ctd\u003eAluminum, black anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":12468325122141,"sku":"93614","price":289.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/93614_Light_Polution_Filter_RASA_8_01.jpg?v=1753225836"},{"product_id":"celestron-1-25-variable-polarizing-filter","title":"1.25\" Variable Polarizing Filter","description":"\u003cul\u003e\n\u003cli\u003eA customizable way to reduce brightness and glare on the brightest celestial objects like the Moon, Venus, Saturn, Jupiter, Mars, and bright double stars\u003c\/li\u003e\n\u003cli\u003eAdjust the level of light transmission from 1-40% for the best possible view for your specific target and current viewing conditions\u003c\/li\u003e\n\u003cli\u003eSimple to use—just rotate filter’s lower ring to adjust brightness\u003c\/li\u003e\n\u003cli\u003eThreads onto any 1.25” eyepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cp\u003eWhen you want to selectively reduce the brightness of celestial objects for a customized view, the Variable Polarizing Filter is the perfect choice. Unlike regular Moon Filters and Neutral Density Filters, the level of brightness can be reduced to just 1% or as much as 40%. To make the adjustment, simply rotate the filter’s lower ring and the image gets brighter or dimmer.\u003c\/p\u003e\n\u003cp\u003eThis filter does not alter the color of the object you’re observing, making it a great choice for astroimaging, especially when imaging the surface of the Moon. By reducing the brightness, lunar details become more pronounced and defined. This filter can also be used to darken the blue-sky background when hunting for planets like Venus or Jupiter in the daylight, making the planet stand out from the background.\u003c\/p\u003e\n\u003cp\u003eThe Variable Polarizing filter threads onto any Celestron 1.25” eyepiece. Lastly, the filter can be threaded on both sides so you can stack it with other filters, such as color or neutral density, if needed.\u003c\/p\u003e\n\u003ch5\u003eInstructions\u003c\/h5\u003e\n\u003cp\u003eFor telescopes that use a diagonal (refractors, SCTs, and Maks), separate the variable polarizing filter into its two halves.  Screw one half (it doesn't matter which half) onto the part of the diagonal that inserts into the telescope.  Put the diagonal back into the telescope, using the thumbscrews to make sure that it is tightly in place. \u003c\/p\u003e\n\u003cp\u003eScrew the other half of the filter onto the bottom of the eyepiece that you're using to observe.  Put the eyepiece into the diagonal; however, don't use the thumbscrews to tighten the eyepiece in place.  Instead, while you're observing, twist the eyepiece slowly to adjust the level of brightness to your liking, anywhere between 1% and 40% transmission.  \u003c\/p\u003e\n\u003cp\u003eFor telescopes that don't use a diagonal (dobsonians\/newtonians), keep the two halves of the filter together.  Screw the filter as one piece onto the bottom of the eyepiece that you're using to observe.  Put the eyepiece into the focuser.  When you want to adjust the level of brightness, pull the eyepiece out of the focuser and give the bottom part of the filter a small twist, and then replace the eyepiece into the focuser.  \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003ctbody id=\"spec-block-1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize diameter\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Housing\u003c\/td\u003e\n\u003ctd\u003eAluminum cell housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStackable Filter\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003eAdjustable for large and small telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions Filter only\u003c\/td\u003e\n\u003ctd\u003e31.4mm x 22.4mm (1.23\" x .88\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions Case only\u003c\/td\u003e\n\u003ctd\u003e68mm x 28mm (2.67\" x 1.1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions Packaging\u003c\/td\u003e\n\u003ctd\u003e72mm x 71mm x 33mm (2.83\" x 2.8\" x 1.3\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight Filter only\u003c\/td\u003e\n\u003ctd\u003e.56 oz (16 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight Case only\u003c\/td\u003e\n\u003ctd\u003e.91 oz (26 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Package Weight\u003c\/td\u003e\n\u003ctd\u003e1.7 oz (50 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":19506058330205,"sku":"94107","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/94107_Variable_Polarizing_Filter_1-25_01_570x380_2x_ad7c97d4-8823-4c59-b151-361fb4cee64e.jpg?v=1546548176"},{"product_id":"celestron-neutral-density-moon-filter-1-25","title":"Neutral Density Moon Filter - 1.25\"","description":"\u003cul\u003e\n\u003cli\u003eReduces brightness and cuts glare, increasing clarity of the Moon, Venus, and bright double stars\u003c\/li\u003e\n\u003cli\u003e13% light transmission\u003c\/li\u003e\n\u003cli\u003eProvides a true color image\u003c\/li\u003e\n\u003cli\u003eThreads on to any 1.25” eyepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cp\u003eThe Neutral Density Moon Filter attaches to a 1.25” eyepiece to lower the amount of light entering the eyepiece by 87%.  The Moon is one of the most viewed objects in the sky, but you shouldn’t be deprived of its features due to brightness.  This filter only allows 13% of the telescope’s light to reach the eyepiece, making it a lot more comfortable to view.   Unlike color filters, the Neutral Density Moon filter affects all colors of the visible spectrum evenly, darkening the image without shifting the color.   Some Moon filters are #58 Green filters, and while they work well for cutting glare, they also add an unnatural green cast to the Moon’s surface.  The Neutral Density Moon filter gives a true color image.  \u003c\/p\u003e\n\u003cp\u003eThis filter is also great for helping to cut glare and increase contrast when viewing bright planets like Venus or Jupiter, or even to dim bright stars when splitting close double stars. The filter is glass with an aluminum cell that attaches to 1.25” eyepieces and is threaded on both sides so it can be stacked with color filters.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003ctbody id=\"spec-block-1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize diameter\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Housing\u003c\/td\u003e\n\u003ctd\u003eAluminum cell housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStackable Filter\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003e13%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions Filter only\u003c\/td\u003e\n\u003ctd\u003e31mm x 11.5mm (1.22\" x .45\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions Case only\u003c\/td\u003e\n\u003ctd\u003e54.5mm x 43mm x 18mm (2.14\" x 1.7\" x .7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions Packaging\u003c\/td\u003e\n\u003ctd\u003e60mm x 50mm x 23mm (2.36\" x 2\" x .9\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight Filter only\u003c\/td\u003e\n\u003ctd\u003e.21 oz (6 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight Case only\u003c\/td\u003e\n\u003ctd\u003e.5 oz (14 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Package Weight\u003c\/td\u003e\n\u003ctd\u003e.88 oz (25 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":19506067734621,"sku":"94105","price":18.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/94105_ND_0-9_Neutral_Density_Filter_1-25_01_570x380_2x_af81f7a0-3434-45d0-9dec-ccca5bbaf1c3.jpg?v=1546548575"},{"product_id":"celestron-lunar-planetary-filter-set-1-25","title":"Lunar \u0026 Planetary Filter Set, 1.25\"","description":"\u003cmeta charset=\"utf-8\"\u003e\n\u003cul\u003e\n\u003cli\u003eA nice beginner’s set of 1.25” planetary filters for any telescope.\u003c\/li\u003e\n\u003cli\u003eSee features on the Moon \u0026amp; planets in a whole new light.\u003c\/li\u003e\n\u003cli\u003eThe aluminum cell is threaded on top and bottom for stacking.\u003c\/li\u003e\n\u003cli\u003eIncludes Wratten #12 Deep Yellow, #21 Orange, #80A Light Blue, and a #ND-96-0.3 Neutral Density Filter with 50% transmission.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003eColored filters can be used to bring out details on a planet’s surface or its cloud structure. All of the planetary filters included in the Celestron Lunar and Planetary Filter Set can be used on any 1.25” eyepiece with the proper filter threads, so they are very versatile. Just screw one onto the eyepiece of choice and slide it into the focuser.\u003c\/p\u003e\n\u003cp\u003eThis Celestron filter set includes the following colors:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e12 Deep Yellow - A good general purpose filter for smaller aperture telescopes (less than 4.5”), the #12 Yellow will improve the contrast of features on the Moon. It will also help you see the equatorial belts on Jupiter and Saturn, clouds and the polar ice caps on Mars, and the dusky detail on Uranus and Neptune.\u003c\/li\u003e\n\u003cli\u003e21 Orange - Sharpens the boundaries along the plains of Mars due to the reduction of blue\/green transmissions. Use on Jupiter and Saturn to enhance detail in the belts and polar regions.\u003c\/li\u003e\n\u003cli\u003e80A Blue - Enhances the contrast of the cloud belts on Jupiter and the polar ice caps on Saturn. It also can be used to increase contrast on the Moon if you don’t mind the color shift.\u003c\/li\u003e\n\u003cli\u003eND-96-0.3 Neutral Density - A great filter for the Moon, and for stacking with other planetary filters to increase density without changing the color. A neutral density filter is also useful when splitting binary star systems (double stars). Use anytime you want to decrease brightness but don’t want to affect the color characteristics of an object.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach Celestron 1.25” filter has 26 mm of clear aperture, and is mounted in a black anodized aluminum cell that is threaded on both sides. Double threads allow the user to stack different filters together to create a custom color or affect the transmission percentage. Special coatings on each filter protect against reflections, ghosting, and scratches. A plastic case is included to keep your filters safe when not in use.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003ctbody id=\"spec-block-1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize Diameter\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Housing\u003c\/td\u003e\n\u003ctd\u003eAluminum cell housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Retainer Ring\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStackable Filter\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePercentage of Light Transmissions (or T)\u003c\/td\u003e\n\u003ctd\u003eDeep Yellow: 74% T | Orange: 46% T | Light Blue: 30% T | Neutral Density: 50% T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (Filter)\u003c\/td\u003e\n\u003ctd\u003e31mm x 11.5mm (1.22\" x .45\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (Case)\u003c\/td\u003e\n\u003ctd\u003e95.25mm x 203.2mm (3.75” x .8”)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (Filter)\u003c\/td\u003e\n\u003ctd\u003e.21 oz (6 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (Case)\u003c\/td\u003e\n\u003ctd\u003e2.82 oz (80 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":20245897511005,"sku":"94119-10","price":50.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/94119-10_Color_Filter-Kit_1-25_01.jpg?v=1554314009"},{"product_id":"moon-filter-set-1-25","title":"Moon Filter Set 1.25 inch","description":"\u003cul\u003e\n\u003cli\u003eFour great Moon filters in one kit—everything you’ll ever need for optimal views of the lunar surface\u003c\/li\u003e\n\u003cli\u003eThree neutral density (ND) filters with different levels of light transmission (13%, 25%, and 50%) allow you to choose the perfect filter for your viewing conditions\u003c\/li\u003e\n\u003cli\u003eMoon \u0026amp; Sky Glow filter provides high contrast views of the lunar surface and enhances observation of deep sky objects from light polluted skies\u003c\/li\u003e\n\u003cli\u003eAluminum filter cells provide a rigid, durable housing for the filter glass and are threaded on top and bottom for stacking\u003c\/li\u003e\n\u003cli\u003eKit includes a plastic carrying case with Moon map and legend for identifying the most popular lunar features\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003eThis Moon Filter Set contains all the filters you will ever need to observe the Moon during its various phases. The set allows you to choose the best filter to use with different eyepiece and telescope combinations. Use the darkest filter with larger aperture telescopes and lower magnification eyepieces. Use the lighter filters with smaller telescopes and higher magnification eyepieces.\u003c\/p\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree neutral density (ND) filters: ND96-0.9 13% T, ND96-0.6 25% T, and ND96-0.3 50% T —\u003c\/strong\u003eThese filters dim the entire visual spectrum from 400-700nm equally. The ND96-0.9 filter transmits 13% of the incoming light, the ND96-0.6 transmits 25% and the ND96-0.3 transmits 50%. They do not impart any color to the Moon, but reduce lunar brightness. With several ND filters to choose from, you can find just the right level of light transmission for the Moon depending on its phase, the aperture of your telescope, and the magnification of your eyepiece. ND filters can also be used reduce the glare from Venus to better see its crescent phases, and to help dim bright daytime views when using a telescope terrestrially.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Moon \u0026amp; Sky Glow filter —\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eThis filter selectively reduces light transmission at different wavelengths and greatly improves contrast for observing subtle lunar features. This filter imparts a very light purple color to the Moon. For those in light-polluted skies, the Moon \u0026amp; Sky Glow filter provides some contrast enhancement when viewing deep sky objects due to the filter blocking some wavelengths associated with common forms of light pollution, e.g. low-pressure sodium (LPS) street lights. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA durable plastic carrying case —\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eThe Moon Filter Set comes with a foam-lined plastic case to store all four filters when they are not in use and protect them during transit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoon map and legend —\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eFamiliarize yourself with the Moon, our neighboring world with the help of our handheld Moon map. The Moon map comes complete with a legend highlighting 17 key features to explore including Sea of Tranquility, Tycho, Plato, Copernicus and many more. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eExplore the Moon\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYour Moon Filter Set also includes a free download of\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/www.celestron.com\/blogs\/celestron-in-the-community\/lunar-landscapes-the-photography-of-robert-reeves\"\u003eRobert Reeves’ eBook, Lunar Landscapes\u003c\/a\u003e,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003ewhich goes into fascinating detail about the sizes of craters, how marias are formed, the natural history of the Moon, and more.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003ctbody id=\"spec-block-1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell housing\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStackable filter threads\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndividual filter weight\u003c\/td\u003e\n\u003ctd\u003e.21 oz (6 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 1\u003c\/td\u003e\n\u003ctd\u003eND96-0.9 13% light transmission\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 2\u003c\/td\u003e\n\u003ctd\u003eND96-0.6 25% light transmission\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 3\u003c\/td\u003e\n\u003ctd\u003eND96-0.3 50% light transmission\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter 4\u003c\/td\u003e\n\u003ctd\u003eMoon and Sky Glow, light purple\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal weight with filters and case\u003c\/td\u003e\n\u003ctd\u003e2.61 oz (74 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":28458130243677,"sku":"94315","price":54.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/94315_Moon_Filter_Kit_1-25_01_570x380_2x_9dd88f39-a8f0-4ccc-abbb-8201b4556995.jpg?v=1560487099"},{"product_id":"optolong-uhc-light-pollution-filter","title":"Optolong UHC Light Pollution Filter","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cspan\u003eThe UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deep sky objects by selectively reducing the transmission of wavelengths of light pollutants.  Specifically, it reduces those produced by artificial lighting, including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights, and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe UHC filter is highly transparent in the main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm), as well as SII (672nm).  The UHC filter enhances the contrast and details for both visual and photographic purposes in areas with heavy light pollution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for color CCD cameras and unmodified DSLRs.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe UHC filter, with a narrower passband, provides higher contrast than the CLS filter. Thus it is more suitable for urban environments which suffer from severe light pollution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe UHC filter has a substantial red passband and offers superb views for objects like the Orion Nebula (M42)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLight pollution filters do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, but without brightening the nebula.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eWhich to Choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eL-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets.\u003c\/li\u003e\n\u003cli\u003eUHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters.\u003c\/li\u003e\n\u003cli\u003eL-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. 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Transmission of 0.1% is equivalent to OD3(Optical Density), where a high optical density value indicates very low transmission, and low optical density indicates high transmission.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Parameter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMulti-layered anti-reflection coating\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNon-cemented optical substrate coating\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength); no deviation affected by temperature change\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-thin filter cell minimizes vignetting by maximizing possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)\u003c\/li\u003e\n\u003cli\u003eAerometal Material\u003c\/li\u003e\n\u003cli\u003ePrecise CNC Machining\u003c\/li\u003e\n\u003cli\u003eSand Blasting Process\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eExtinction Treatment to Prevent Reflection\u003c\/li\u003e\n\u003cli\u003eLaser Engraving No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 1.25”\u003c\/li\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eClip Filters for crop sensors and full sensors\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSpectral Curve (see image)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eTransmits the major emission lines of nebulae\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eH-β 486.1nm, OIII 495.9nm, OIII 500.7nm, H-α 656.3nm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBlocks the major emission lines of artificial light pollution\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMercury (Hg): 435.8nm, 546.1nm, 577nm, 578.1nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSodium (Na): 598nm, 589.6nm, 615.4nm, 616.1nm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":31075926474845,"sku":"10101","price":55.0,"currency_code":"USD","in_stock":false},{"title":"2\"","offer_id":31075926507613,"sku":"10102","price":85.0,"currency_code":"USD","in_stock":true},{"title":"Canon EOS APS-C Clip-in","offer_id":31075926540381,"sku":"10103","price":95.0,"currency_code":"USD","in_stock":true},{"title":"Canon EOS Full Frame Clip-in","offer_id":31075926573149,"sku":"10104","price":115.0,"currency_code":"USD","in_stock":true},{"title":"Nikon DSLR Full Frame Clip-in","offer_id":31075926605917,"sku":"10105","price":115.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/optolong_uhc.jpg?v=1572457445"},{"product_id":"optolong-light-pollution-broadband-filter-l-pro","title":"Optolong L-Pro Light Pollution Broadband Filter","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cspan\u003eThe L-Pro (L-Professional) filter is the \u003c\/span\u003e\u003cspan\u003ebest light pollution filter with multi-bandpass filter which offers better color balance by maximizing the transmission band b\u003c\/span\u003e\u003cspan\u003ey selectively reducing the transmission of wavelengths of light pollutants.  Specifically, those produced by artificial lighting, including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cspan\u003eThe L-Pro filter enhances highly transparent main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm). It enhances the contrast and details \u003c\/span\u003efor both visual and photographic purposes in areas with heavy light pollution.\u003c\/p\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eWhich to Choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eL-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula, galaxy, star cluster, and comet targets.\u003c\/li\u003e\n\u003cli\u003eUHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies, clusters, or comets.\u003c\/li\u003e\n\u003cli\u003eL-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-Enhance will provide the most faint detail on emission nebula, and the UHC is a budget option in the middle.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003eIMPORTANT Limitation of the EOS-R Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDue to the particularity of Canon R series micro-single optical path, aperture design and light incident Angle, slight dark angle interference will occur when using an interference filter such as the L-Pro clip filter for imaging. \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThere are two solutions to solve peripheral interference phenomenon： 1. 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Gap between green and red filters serves to block out the primary Sodium light pollution line at 589 nm and improves color balance and separation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eWorks well with debayered monochrome CCD cameras\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for deep sky and planetary CCD imaging\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRGB-imaging allows equal weighting factors for each channel, which is very important for automated imaging.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe ideal raw material for image processing in the sRGB color space is available with LRGB filter set and a mono CCD camera. \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSchott substrate material\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThickness 2.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over both surfaces\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e95% transmission at bandpass\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInfrared wavelength 700 to 1100 nm cut-off\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePrecision off-band blocking\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTavg: T\u0026gt;95%\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCoating Wavelength: 300-1050nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptical Density: OD3\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Parameter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMulti-layered anti-reflection coatings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNon-cemented optical substrate coatings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength); no deviation affected by temperature change\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eUltra-thin filter cell minimizes vignetting by maximizing the possible clear aperture (clear aperture is 26 mm for 1.25-inch; 45 mm for 2-inch)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAerometal Material\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePrecise CNC Machining\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSand Blasting Process\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBlack Anodized Finish\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eExtinction Treatment to Prevent Reflection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLaser Engraving No Fading\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 1.25”\u003c\/li\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003cli\u003eRound 31mm Unmounted\u003c\/li\u003e\n\u003cli\u003eRound 36mm Unmounted\u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":31076336304221,"sku":"AT200005","price":229.0,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":31076336336989,"sku":"AT200006","price":359.0,"currency_code":"USD","in_stock":false},{"title":"36mm Unmounted","offer_id":31076336402525,"sku":"AT200008","price":269.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/7bc91445e07fd964e473fc6458afa39b.jpg?v=1776544535"},{"product_id":"optolong-variable-polarizer-filter-2","title":"Optolong Variable Polarizer Filter - 2\"","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eAdjust the brightness level of the Moon, Venus, and other bright objects with the Optolong Variable Polarizer. A standard Moon Filter is similar to a pair of sunglasses. They work fine, but sometimes the scene is too dark or too bright, and there’s not a lot you can do about it. A variable polarizing filter is much more flexible than a Moon filter. It allows you to set the percentage of attenuation by turning the top section of the two-piece filter. Simply attach the 2” threaded filter to a like-sized eyepiece or astro accessory barrel, and then slowly rotate the top half of the filter—it turns 360°—to achieve the results you desire. Now you can apply more filtering to a full moon and less to a beautiful crescent—it’s your call.\u003c\/p\u003e\n\u003cp\u003eThe Optolong 2” Variable Polarizing Filter also works great to cut brightness when you are using your telescope for terrestrial observations or photography. If you have ever done photography through a SLR or DSLR camera, you may have already been introduced to the qualities of a polarizing filter, since it is a very popular accessory for polarizing the light and making the sky appear more blue. You will especially appreciate a polarizing filter when viewing over water or photographing a scene that includes a river or body of water. Simply turn the filter until you achieve the most glare-free results—you will really see the difference.\u003c\/p\u003e\n\u003cp\u003eThe Optolong 2” Variable Polarizing Filter is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 45mm.\u003c\/p\u003e\n\u003ch5\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\n\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTechnical Data\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSchott substrate material\u003c\/li\u003e\n\u003cli\u003eThickness 2.0mm \u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eOptically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over both surfaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Parameter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNon-cemented optical substrate coating\u003c\/li\u003e\n\u003cli\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength); no deviation affected by temperature change\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-thin filter cell minimizes vignetting by maximizing possible clear aperture (clear aperture is 45mm for 2”)\u003c\/li\u003e\n\u003cli\u003eAerometal Material\u003c\/li\u003e\n\u003cli\u003ePrecise CNC Machining\u003c\/li\u003e\n\u003cli\u003eSand Blasting Process\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eExtinction Treatment to Prevent Reflection\u003c\/li\u003e\n\u003cli\u003eLaser Engraving No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":31077157503069,"sku":"12502","price":48.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/variable_polarizer_2.jpg?v=1572466640"},{"product_id":"optolong-o-iii-25nm-light-pollution-filter","title":"Optolong O-III 18nm Light Pollution Filter","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe O-III 18nm filter is designed for nebula observation, NOT for imaging. It transmits 18nm bandwidth, centered on a wavelength of 500nm, which corresponds to OIII emission lines.  It also reduces the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights, as well as the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe OIII filter emits 495.9nm and 500.7nm.  It is a blue-green colored filter. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for viewing bright nebulae like M42 Orion Nebula in heavy light pollution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUse with a large aperture telescope under clear and dark viewing conditions with good seeing.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNarrowband filters do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, without brightening the nebula.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTechnical Data\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSchott substrate material\u003c\/li\u003e\n\u003cli\u003eThickness 2.0mm\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003c\/li\u003e\n\u003cli\u003e90% transmission at major OIII line 495.9nm and 500.7nm\u003c\/li\u003e\n\u003cli\u003ePrecision off-band blocking,  specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Parameter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNon-cemented optical substrate coating\u003c\/li\u003e\n\u003cli\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength); no deviation affected by temperature change\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-thin filter cell minimizes vignetting by maximizing possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)\u003c\/li\u003e\n\u003cli\u003eAerometal Material\u003c\/li\u003e\n\u003cli\u003ePrecise CNC Machining\u003c\/li\u003e\n\u003cli\u003eSand Blasting Process\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eExtinction Treatment to Prevent Reflection\u003c\/li\u003e\n\u003cli\u003eLaser Engraving No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 1.25”\u003c\/li\u003e\n\u003cli\u003eStandard 2”\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":31077276090461,"sku":"1271","price":79.0,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":31077276123229,"sku":"1272","price":108.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/oiii_filters_1.jpg?v=1572467862"},{"product_id":"optolong-l-enhance-filter","title":"Optolong L-eNhance Filter","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cspan\u003eThe relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astrophotographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters, and a filter wheel.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eL-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. \u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eOptolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eL-eNhance Filter Spectrum Curve\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003eAccording to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution.\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eWhich to Choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eL-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets.\u003c\/li\u003e\n\u003cli\u003eUHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters.\u003c\/li\u003e\n\u003cli\u003eL-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-Enhance will provide the most faint detail on emission nebula, and the UHC is a budget option in the middle.\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003ctable border=\"1\" style=\"width: 501px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003eSubstrate:\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003eThickness:\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003eTpeak:\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003eT\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003eBlocking range:\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003eBlocking depth:\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003elight pollution line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003eSurface quality:\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003eTransmitted Wavefront RMS:\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003e\u003cspan\u003eλ\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 237px;\"\u003e\u003cspan\u003eParallelism (arcsec):\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 252px;\"\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Parameter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNon-cemented optical substrate coating\u003c\/li\u003e\n\u003cli\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength); no deviation affected by temperature change\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-thin filter cell minimizes vignetting by maximizing possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)\u003c\/li\u003e\n\u003cli\u003eAerometal Material\u003c\/li\u003e\n\u003cli\u003ePrecise CNC Machining\u003c\/li\u003e\n\u003cli\u003eSand Blasting Process\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eExtinction Treatment to Prevent Reflection\u003c\/li\u003e\n\u003cli\u003eLaser Engraving No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 1.25”\u003c\/li\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003cli\u003eCanon APS-C Clip Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAPS-C Clip filter is tested and compatible with the following camera models: 7D2\/80D\/800D\/77D\/70D\/760D\/750D\/700D 650D\/600D\/550D\/500D\/400D\/100D\/1100D 1200D\/1300D\u003c\/p\u003e\n\u003cp\u003eClip filters are compatible with EF lenses, but not EF-S lenses.\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":31077630017629,"sku":"L-eN-1","price":179.0,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":31077630083165,"sku":"L-eN-2","price":229.0,"currency_code":"USD","in_stock":true},{"title":"APS-C Clip Filter","offer_id":32447835799645,"sku":"L-eN-EOS-C","price":259.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/l-enhance_filter_2_flat_520x520_fcee4dae-64c2-45e7-84e8-ac4d680690ae.jpg?v=1572470912"},{"product_id":"optolong-l-extreme-filter","title":"Optolong L-eXtreme Filter","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eUnlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines. \u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eL-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L- eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter. \u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eThe advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution. \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch4\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eWhich to Choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eL-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets.\u003c\/li\u003e\n\u003cli\u003eUHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters.\u003c\/li\u003e\n\u003cli\u003eL-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. \u003c\/li\u003e\n\u003cli\u003eL-eXtreme is a dual-narrow-band filter providing the tightest spectrum in only H-Alpha and OIII. Suitable for deep sky imaging under light polluted skies, and delivering the richest nebula detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-eXtreme will provide the most faint detail on emission nebula, and the UHC is a budget option in the middle.\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv title=\"Page 3\" class=\"page\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSubustrate \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eB270 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eThickness \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e1.85mm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eFWHM \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eO3 7nm+Ha 7nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking range \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e300-1000nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking depth \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003elight pollution lines blocked \u0026gt;99.9% \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSurface quality \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e60\/40 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront RMS: \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eλ\/4 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eParallelism \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e30''\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 1.25”\u003c\/li\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"2\"","offer_id":35319126687911,"sku":"lextreme-2.0","price":309.0,"currency_code":"USD","in_stock":true},{"title":"1.25\"","offer_id":35319126655143,"sku":"lextreme-1.25","price":239.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/DSC_1815.jpg?v=1782006559"},{"product_id":"optolong-l-ultimate-filter","title":"Optolong L-Ultimate Filter","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eA 3nm dual band filter designed to drastically reduce the effect of light pollution. The 3nm bandpass isolates the nebulae emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch4\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eWhich to Choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eL-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets.\u003c\/li\u003e\n\u003cli\u003eUHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters.\u003c\/li\u003e\n\u003cli\u003eL-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. \u003c\/li\u003e\n\u003cli\u003eL-eXtreme is a dual-narrow-band 7nm filter providing a tight spectrum in only H-Alpha and OIII. Suitable for deep sky imaging under light polluted skies, and delivering the richest nebula detail.\u003c\/li\u003e\n\u003cli\u003eL-Ultimate is a dual-narrow-band filter, an enhanced version of the L-eXtreme with just a 3nm bandpass on both Ha and OIII.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-Ultimate will provide the most faint detail on emission nebula.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe L-Ultimate is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv title=\"Page 3\" class=\"page\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSubustrate \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eoptical glass\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eThickness \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e1.85mm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eFWHM \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eO3 3nm+Ha 3nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking range \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026gt;OD4\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSurface quality \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e60\/40 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront RMS: \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eλ\/4 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eParallelism \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e30 seconds\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5\u003e\n\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 1.4em;\"\u003eSample Images \u003c\/span\u003e\u003cbr\u003e\n\u003c\/h5\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003e\u003cspan\u003eNebulae Flying Bat and Squid in the constellation of Cepheus.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003e\u003cspan\u003eSquid (OU4) is a region characterized by very weak OIII emission with a bipolar shape reminiscent of planetary nebulae. Recent studies suggest that Ou4 is actually internal to SH2-129 (the H-alpha-emitting flying bat nebula, reddish in the image), generated by a triple star system located in the center (HR8119, visible as the bright star in the center of Squid).\u003cbr\u003eThe distance from our solar system is estimated at about 1300 light years.\u003cbr\u003eThe lights were taken over 2 years, with total integration equal to 29 hours (21.5 for OU4 and 7.5 for SH2-129).\u003cbr\u003eThis project gave me the opportunity to test the Omegon veTEC 571C camera and the Optolong L-Ultimate filter with excellent results for both products.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLights: 258x300s (Ou4, L-Extreme) + 30x900s (Sh2-129, L-Ultimate)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTelescope1: Apocromatic TS PhotoLine 102 f\/5,6 Triplet FPL53\u003cbr\u003eTelescope2: Takahashi FS60CB @ f\/4.2\u003cbr\u003eCamera1: ZWO ASI 294mc Pro\u003cbr\u003eCamera2: Omegon veTEC 571C\u003cbr\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr\u003eFilters: Optolong Astronomy Filter L-Extreme + L-Ultimate\u003cbr\u003eProcessing: DeepSkyStacker, Photoshop CC, PixInsight \u003cbr\u003eCredit:Tommaso Massimo Stella (Italy)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/8e82dcbd4356c2b25658ae4d38898da9_480x480.jpg?v=1667493434\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/8e82dcbd4356c2b25658ae4d38898da9_480x480.jpg?v=1667493434\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cu\u003e\u003cstrong\u003eObjects: Veil Nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCamera: QHY168C\u003cbr\u003eTelescope: Pentax 100 SDUF II F\/4\u003cbr\u003eMount: Skywatcher AZ-EQ5GT\u003cbr\u003eFilter: Optolong 3nm L-Ultimate Filter\u003cbr\u003eFrames: 13 x 240sec lights\u003cbr\u003eCredit:Tommy Lim KW (Malaysia)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/0a012c0ef16bddfb90595bf2502e3c51_480x480.jpg?v=1667493440\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/0a012c0ef16bddfb90595bf2502e3c51_480x480.jpg?v=1667493440\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cu\u003e\u003cstrong\u003eSh2-132 The Lion nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eProsegue il test del filtro  Ultimate della Optolong Astronomy Filter\u003cbr\u003e96 light da 300 sec \u003cbr\u003eNo dark no flat\u003cbr\u003eCredit:Andrea Maggi\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/31ceb16a19983c46396af72fe7ba3cc1_480x480.jpg?v=1667493448\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/31ceb16a19983c46396af72fe7ba3cc1_480x480.jpg?v=1667493448\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eSupernova remnant W63\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSupernova remnant W63 glows like a faint cosmic smoke ring along the plane of the Milky Way toward the northern constellation Cygnus. Its spectral appearance is reflected in the region's rich complex of interstellar clouds and dust by an eerie blue glow, captured with Optolong's new dual band 3nn filter!! L-Ultimate...\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCanon Eos MK IV mod by CentralDS 20x900\" ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eSkywatcher AZ-GTI mount\u003cbr\u003eGuide camera ZWO ASI 120MM\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/4672efc207e69c658cf26c68e7bea6a4_480x480.jpg?v=1667493581\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/4672efc207e69c658cf26c68e7bea6a4_480x480.jpg?v=1667493581\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eSharpless 129\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCanon Eos MK IV mod by CentralDS 30x900\" ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/f94ddb185f8fe14b6659bda59bfa14f0_480x480.jpg?v=1667493630\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/f94ddb185f8fe14b6659bda59bfa14f0_480x480.jpg?v=1667493630\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cu\u003e\u003cstrong\u003eNGC6888 HOO Version\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eTelescope ASKAR 500\u003cbr\u003eCamera Zwo ASI 6200\u003cbr\u003eFilter Optolong 3nm\u003cbr\u003eSoftware Voyager\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/1d8c80c3e194a0161f9b4569df88ff1f_480x480.jpg?v=1667493636\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/1d8c80c3e194a0161f9b4569df88ff1f_480x480.jpg?v=1667493636\"\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"2\"","offer_id":44553797468419,"sku":"L-Ultimate-2","price":389.0,"currency_code":"USD","in_stock":true},{"title":"1.25\"","offer_id":44553797501187,"sku":"L-Ultimate-1","price":289.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/2068a0bfc30cc1d647278f282dffe5fb.jpg?v=1667492836"},{"product_id":"nebula-filter-for-celestron-origin","title":"Nebula Filter for Celestron Origin","description":"\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eGet the Most Out of Your Origin:\u003c\/strong\u003e Enhance your Celestron Origin’s views and images of nebulae—especially from urban and suburban skies. This filter blocks light pollution, boosts image contrast, and darkens the sky background for noticeably better images.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eNebulae Come to Life:\u003c\/strong\u003e This filter transmits only the key Hα-Hβ-OIII wavelengths from emission nebulae, making their colors “pop” from the dark background.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eConquers Light Pollution:\u003c\/strong\u003e With this filter, you allow the “good” wavelengths of light from nebulae through but block the “bad” light pollution from reaching Origin’s sensor.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eBuilt for Origin’s RASA Optics:\u003c\/strong\u003e Unlike similar filters with narrower bandpasses, this filter was engineered specifically to work with Origin’s fast f\/2.2 optics to allow more of the light you want while suppressing the light you don’t.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eEasy Installation:\u003c\/strong\u003e Simply remove the optical window from Origin’s filter drawer and insert the Nebula Filter. It won’t disrupt the optical path of your Origin, and no additional adapters are needed.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eQuality Construction: \u003c\/strong\u003eConstructed of Schott glass with anti-reflective coatings, this filter’s surfaces are 100% optically flat and free from defects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003eProduct description:\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eEnjoy the most dazzling views of nebulae with your Celestron Origin when you add this H-alpha H-beta OIII (Hα-Hβ-OIII) imaging filter. This specialized filter allows high throughput of light wavelengths in emission nebulae while blocking other wavelengths that could diminish image quality and detail. The result is bright, colorful nebulae images that “pop” with detail against the black sky background.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHow does the Nebula Filter for Origin work? Emission nebulae primarily emit at discrete wavelengths of light—Hα at 656nm, Hβ at 486nm, and OIII at 496\/501nm. By strategically transmitting only these wavelengths of light and blocking the rest of the spectrum, the filter dramatically reduces the effect of light pollution. The “bad” light is blocked while the “good” light associated with emission nebulae passes through to Origin’s sensor.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou’ll immediately notice much higher contrast in your images, especially from your light-polluted backyard! And since the transmission at the critical wavelengths is so high, the nebula will not be dimmed—only the background will be blacker. You’ll also notice some contrast improvement in images of nebulae from darker skies, as the filter serves well in blocking natural skyglow.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNebula Hunting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Nebula Filter is perfect for imaging emission nebulae like the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42), the Carina Nebula (NGC 3372), and dozens more. The imaging filter offers maximum light transmission in the key Hα-Hβ-OIII wavelengths, producing high contrast for emission nebulae like these.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe transmission spectrum for the Nebula Filter is 85% or greater at key wavelengths (486nm, 496nm\/501nm, 656nm) and less than 0.5% transmission elsewhere. As a narrowband filter, it blocks much of the visible spectrum and only lets these specific wavelengths through. Because of this, you should not use this filter while observing or imaging broadband emission objects, such as galaxies and star clusters. For those objects, you’ll achieve the best results by removing the nebula filter and reinstalling Origin’s clear optical window.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/93669_Nebula_Filter_for_Origin_07_600x600.jpg?v=1704311315\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/93669_Nebula_Filter_for_Origin_07_600x600.jpg?v=1704311315\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOther similar imaging filters on the market have much narrower bandpasses at the critical Hα-Hβ-OIII wavelengths. Unfortunately, these filters block much of the incoming Hα-Hβ-OIII light for an f\/2.2 optical system like Origin’s 6” RASA. This is because a RASA brings light into the filter at a steeper angle, which causes a spectral shift. If you use filters not explicitly designed for use at f\/2.2, some of the light from the nebula will be blocked, resulting in a dimmer image. The Nebula Filter for Origin was custom-engineered to work at f\/2.2, so none of the “good” light from the nebula is inadvertently blocked by the filter.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBody and Storage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe filter features a machined aluminum black anodized cell with a knurled rim for easy grip during installation.  We’ve added anti-reflection coatings to help suppress reflections on the glass. The filter fits directly into the filter drawer in the Celestron Origin’s front lens cell, where the optical window sits. Simply remove the clear window and replace it with the filter. Origin maintains its optical performance across the entire system with the filter installed. No other adapter is needed.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eEach filter comes with a foam-lined plastic storage case to safely store the filter or the optical window glass that came with your Celestron Origin when not in use.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCelestron tests every Nebula Filter for Origin individually to verify its performance. Along with your filter, you will receive a spectral transmission graph (like the one pictured above) showing the results of your filter’s test and verifying it performs as expected throughout the spectrum.\u003c\/p\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003eSpecs:\u003c\/h2\u003e\n\u003ctable width=\"557\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eGlass type\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSchott B270\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eGlass thickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2mm (0.078”)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eClear aperture\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e24mm (0.94”)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eCoatings\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDichroic multi-bandpass and multi-layer anti-reflection coatings\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAluminum, black anodized\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter threads\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eM28.5 x 0.6, fits standard 1.25” filter threads\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHeight of cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e6mm total (4mm shoulder height, 2mm thread height)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44544185041155,"sku":"93669","price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/93669_Nebula_Filter_for_Origin_01.jpg?v=1774393830"},{"product_id":"optolong-l-quad-enhance-filter","title":"Optolong L-Quad Enhance Filter 2\"","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eL-Quad Enhance Filter is a quad bandpass light pollution suppression filter for colour cameras.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBetter suppression of starbursts; Higher contrast and more details of the celestial bodies; Better colour saturation; Great performance on signal-to-noise ratio (SNR); \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNear IR cut-off to 1000nm, reducing the effects of IR noise; \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGood for night sky from Bortel 1 to Bortel 7 levels; \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for wide range of deep sky targets cover most nebulae, galaxies, star clusters, reflected and emitted line signals astronomical objects with higher contrast and rich details while maintaining excellent colour balance. \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eL-QEF has more than 90% transmittance of the nebula emission lines at H-Beta\/OIII\/H-Alpha\/SII, with cut-off depth from OD2 to OD4, thus providing a significant increase in resistance to light pollution. L-QEF is good for night sky from Bortel 1 to Bortel 7 levels; (Bortel 8, Bortel 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3nm, 7nm type of filters are available.);\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch4\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eWhich to Choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eL-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets.\u003c\/li\u003e\n\u003cli\u003eL-Quad similar to L-Pro, but more tailored for color astronomical cameras.\u003c\/li\u003e\n\u003cli\u003eUHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters.\u003c\/li\u003e\n\u003cli\u003eL-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. \u003c\/li\u003e\n\u003cli\u003eL-eXtreme is a dual-narrow-band 7nm filter providing a tight spectrum in only H-Alpha and OIII. Suitable for deep sky imaging under light polluted skies, and delivering the richest nebula detail.\u003c\/li\u003e\n\u003cli\u003eL-Ultimate is a dual-narrow-band filter, an enhanced version of the L-eXtreme with just a 3nm bandpass on both Ha and OIII.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-Ultimate will provide the most faint detail on emission nebula.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe L-Ultimate is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h5\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv title=\"Page 3\" class=\"page\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSubstrate \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eoptical glass\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eThickness \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e1.85mm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eFWHM \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eO3 3nm+Ha 3nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking range \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026gt;OD4\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSurface quality \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e60\/40 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront RMS: \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eλ\/4 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eParallelism \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e30 seconds\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5\u003e\n\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 1.4em;\"\u003eSample Images \u003c\/span\u003e\u003cbr\u003e\n\u003c\/h5\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003e\u003cspan\u003eNebulae Flying Bat and Squid in the constellation of Cepheus.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003e\u003cspan\u003eSquid (OU4) is a region characterized by very weak OIII emission with a bipolar shape reminiscent of planetary nebulae. Recent studies suggest that Ou4 is actually internal to SH2-129 (the H-alpha-emitting flying bat nebula, reddish in the image), generated by a triple star system located in the center (HR8119, visible as the bright star in the center of Squid).\u003cbr\u003eThe distance from our solar system is estimated at about 1300 light years.\u003cbr\u003eThe lights were taken over 2 years, with total integration equal to 29 hours (21.5 for OU4 and 7.5 for SH2-129).\u003cbr\u003eThis project gave me the opportunity to test the Omegon veTEC 571C camera and the Optolong L-Ultimate filter with excellent results for both products.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLights: 258x300s (Ou4, L-Extreme) + 30x900s (Sh2-129, L-Ultimate)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTelescope1: Apocromatic TS PhotoLine 102 f\/5,6 Triplet FPL53\u003cbr\u003eTelescope2: Takahashi FS60CB @ f\/4.2\u003cbr\u003eCamera1: ZWO ASI 294mc Pro\u003cbr\u003eCamera2: Omegon veTEC 571C\u003cbr\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr\u003eFilters: Optolong Astronomy Filter L-Extreme + L-Ultimate\u003cbr\u003eProcessing: DeepSkyStacker, Photoshop CC, PixInsight \u003cbr\u003eCredit:Tommaso Massimo Stella (Italy)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/8e82dcbd4356c2b25658ae4d38898da9_480x480.jpg?v=1667493434\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/8e82dcbd4356c2b25658ae4d38898da9_480x480.jpg?v=1667493434\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cu\u003e\u003cstrong\u003eObjects: Veil Nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCamera: QHY168C\u003cbr\u003eTelescope: Pentax 100 SDUF II F\/4\u003cbr\u003eMount: Skywatcher AZ-EQ5GT\u003cbr\u003eFilter: Optolong 3nm L-Ultimate Filter\u003cbr\u003eFrames: 13 x 240sec lights\u003cbr\u003eCredit:Tommy Lim KW (Malaysia)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/0a012c0ef16bddfb90595bf2502e3c51_480x480.jpg?v=1667493440\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/0a012c0ef16bddfb90595bf2502e3c51_480x480.jpg?v=1667493440\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cu\u003e\u003cstrong\u003eSh2-132 The Lion nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eProsegue il test del filtro  Ultimate della Optolong Astronomy Filter\u003cbr\u003e96 light da 300 sec \u003cbr\u003eNo dark no flat\u003cbr\u003eCredit:Andrea Maggi\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/31ceb16a19983c46396af72fe7ba3cc1_480x480.jpg?v=1667493448\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/31ceb16a19983c46396af72fe7ba3cc1_480x480.jpg?v=1667493448\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eSupernova remnant W63\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSupernova remnant W63 glows like a faint cosmic smoke ring along the plane of the Milky Way toward the northern constellation Cygnus. Its spectral appearance is reflected in the region's rich complex of interstellar clouds and dust by an eerie blue glow, captured with Optolong's new dual band 3nn filter!! L-Ultimate...\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCanon Eos MK IV mod by CentralDS 20x900\" ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eSkywatcher AZ-GTI mount\u003cbr\u003eGuide camera ZWO ASI 120MM\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/4672efc207e69c658cf26c68e7bea6a4_480x480.jpg?v=1667493581\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/4672efc207e69c658cf26c68e7bea6a4_480x480.jpg?v=1667493581\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eSharpless 129\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCanon Eos MK IV mod by CentralDS 30x900\" ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/f94ddb185f8fe14b6659bda59bfa14f0_480x480.jpg?v=1667493630\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/f94ddb185f8fe14b6659bda59bfa14f0_480x480.jpg?v=1667493630\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cu\u003e\u003cstrong\u003eNGC6888 HOO Version\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eTelescope ASKAR 500\u003cbr\u003eCamera Zwo ASI 6200\u003cbr\u003eFilter Optolong 3nm\u003cbr\u003eSoftware Voyager\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/1d8c80c3e194a0161f9b4569df88ff1f_480x480.jpg?v=1667493636\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/products\/1d8c80c3e194a0161f9b4569df88ff1f_480x480.jpg?v=1667493636\"\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":44553778790659,"sku":"L-QEF","price":199.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/c656702f1ca52b7dc92d472bba4be081.jpg?v=1752706870"},{"product_id":"h-alpha-h-beta-oiii-h-h-oiii-imaging-filter-for-the-8-rasa","title":"H-alpha H-beta OIII (Hα-Hβ-OIII) Imaging Filter for the 8” RASA","description":"\u003cmeta charset=\"utf-8\"\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eEnhance imaging of nebulae with your 8” Rowe-Ackermann Schmidt Astrograph (RASA) by blocking light pollution, improving image contrast, and darkening the sky background.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThis filter transmits only the key Hα-Hβ-OIII wavelengths from emission nebulae, providing high contrast that makes them “pop.”\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThis filter selectively blocks wavelengths of light from sources of light polluted skies and natural sky glow.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eUnlike similar filters with narrower bandpasses, this filter was engineered specifically to work with RASA’s fast F\/2 optics.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eFits into the 8” RASA’s integrated filter mount, maintaining peak optical performance.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eOptically flat surfaces free of defects, constructed of Schott glass with anti-reflection coatings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eDescription\u003c\/h4\u003e\n\u003cp\u003eBring out the best in your nebulae astroimages with the H-alpha H-beta OIII (Hα-Hβ-OIII) Imaging Filter for the 8” RASA. This specialized filter allows high transmission of light from emission nebulae while blocking light pollution, helping to make your images pop with detail off the black sky background with superior contrast.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eFortunately, many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these “bad” wavelengths, the filter essentially eliminates the effect of light pollution while letting the “good” wavelengths of light associated with the emission nebula pass through to the camera. You’ll notice much higher contrast in your images immediately, even if imaging from your light polluted backyard! And since the transmission at the key wavelengths is so high, the nebula will not be dimmed—only the background will be blacker.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003e\u003cbr\u003e\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003eNebula Hunting\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Hα-Hβ-OIII Imaging Filter for the 8” RASA is perfect for imaging emission nebulae like the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42), and the Carina Nebula (NGC 3372). The imaging filter transmits key Hα-Hβ-OIII wavelengths that produce high contrast for emission nebulae.\u003c\/p\u003e\n\u003cp\u003eThe transmission spectrum for the Hα-Hβ-OIII Imaging Filter is 85% or greater at key wavelengths (486nm, 496nm\/501nm, 656nm) and less than 0.5% transmission elsewhere. The Hα-Hβ-OIII Imaging Filter for the 8” RASA is a narrowband filter that blocks much of the visible spectrum and only lets specific wavelengths through. Because of this, it will not work well on broadband emission objects, such as galaxies and star clusters.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1935\/4371\/files\/93619_H_-H_-OIII_Imaging_Filter_RASA_8_04_480x480.jpg?v=1618006550\"\u003e\u003c\/p\u003e\n\u003cp\u003eOther similar imaging filters on the market have much narrower bandpasses at the critical Hα-Hβ-OIII wavelengths, but these filters will actually block much of the incoming Hα-Hβ-OIII light for an F\/2 optical system. This is because the light is coming into the filter at a steeper angle, which causes a spectral shift. Using filters not designed specifically for use at F\/2 will cause some of the light from the nebula to be blocked, resulting in a dimmer image. The Celestron Hα-Hβ-OIII Imaging Filter for the RASA 8 was custom engineered to work at F\/2, so none of the “good” light from the nebula is inadvertently blocked by the filter.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003eBody and Storage\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe filter is machined aluminum black anodized cell with knurled rim for easy grip during installation.  An anti-reflection coating has been added to the filter to help suppress reflections on the glass. The filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window normally mounts. By removing the clear window and replacing it with the filter, optical performance for the entire system is maintained. No other adapter is needed.\u003c\/p\u003e\n\u003cp\u003eEach filter comes with a foam-lined plastic storage case and retaining ring to safely store the filter or the placeholder optical window glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.\u003c\/p\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable id=\"product-specs-list\" class=\"table-open\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass type:\u003c\/td\u003e\n\u003ctd\u003eSchott B270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass thickness:\u003c\/td\u003e\n\u003ctd\u003e2mm (0.078\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter diameter:\u003c\/td\u003e\n\u003ctd\u003e46mm (1.81\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear aperture:\u003c\/td\u003e\n\u003ctd\u003e43mm (1.69\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings:\u003c\/td\u003e\n\u003ctd\u003eDichroic multi-bandpass and multi-layer anti-reflection coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter cell:\u003c\/td\u003e\n\u003ctd\u003eAluminum, black anodized, knurled rim\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca href=\"https:\/\/celestron-site-support-files.s3.us-east-1.amazonaws.com\/support_files\/93619_H%CE%B1-H%CE%B2-OIII_Imaging_Filter_RASA_8_Manual_ENG_HalfPage_122320_PRINT.pdf\"\u003eHα-Hβ-OIII Imaging Filter, RASA 8 instruction sheet\u003c\/a\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44736197886211,"sku":"93619","price":329.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/93614_Light_Polution_Filter_RASA_8_01_570x380_2x_a57067fa-4a3a-4457-b720-d62ee6dc55af.webp?v=1708616922"},{"product_id":"used-zwo-2-blue-imaging-filter","title":"Used ZWO 2\" Blue Imaging Filter","description":"\u003ch3\u003ePRICE DROP:  Was $50, now $40!!!\u003c\/h3\u003e\n\u003cp\u003eThis 2'' blue filter was part of a set of 4 2'' ZWO LRGB filters, which we are selling individually.  It is in excellent condition, with clean glass and coatings.  Comes in its original jewel case.   \u003c\/p\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003cp\u003e   \u003c\/p\u003e\n\u003cp\u003eZWO's 2\" filter design boasts excellent 92% transmission at passband, great optical coatings, and good color separation.\u003c\/p\u003e\n\u003cp\u003eThe LRGB filters have a mechanical thickness of 5mm, with an additional 2.5mm added for the thread. The optical thickness measures in at 1.85mm. Each filter is more parfocal with a thickness of 1.9+\/-0.03 mm. As for the thread, this filter comes with a M48x0.75 thread.\u003c\/p\u003e\n\u003cp\u003eEach filter is fine-optically polished to reach an accuracy of 1\/4 wave and is equipped with anti-reflection coatings.  Additionally, the ZWO LRGB filters have precision off-brand blocking.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable role=\"table\" class=\"table table--scope-row\" id=\"product-attribute-specs-table\" tabindex=\"0\"\u003e\n\u003ccaption class=\"table__caption\"\u003eProduct specification\u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eSKU Number\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"SKU Number\" class=\"data\"\u003eZWO-LRGB2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eModel Number\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Model Number\" class=\"data\"\u003eLRGB2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eSingle Filter, Set, or Accessory\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Single Filter, Set, or Accessory\" class=\"data\"\u003eFilter Set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eFilter Type\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Filter Type\" class=\"data\"\u003eRGB Sets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eFilter Size\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Filter Size\" class=\"data\"\u003e50.8mm (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eFilter Shape\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Filter Shape\" class=\"data\"\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eFilter Insert Style\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Filter Insert Style\" class=\"data\"\u003eThreaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eFilter Optical Thickness\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Filter Optical Thickness\" class=\"data\"\u003e1.85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003e\n\u003cdiv class=\"table__heading-wrapper\"\u003eFilter Mechanical Thickness\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd role=\"gridcell\" data-th=\"Filter Mechanical Thickness\" class=\"data\"\u003e7.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!----\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":45435720073475,"sku":"U2405-SB-ZWOB2","price":40.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/436360383_805229811567093_4491215849660279630_n.jpg?v=1716329121"},{"product_id":"optolong-sho-3nm-2-3-filter-set","title":"Optolong SHO 3nm (3 Filter Set)","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eOptolong SHO-3nm filter kit includes SII3nm, H-Alpha3nm, and OIII3nm narrow band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can process Hubble images by astronomical post processing software. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOptolong SHO-3nm Narrowband Filters Introduction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong SHO-3nm filter kit includes SII 3nm, H-Alpha 3nm, and OIII 3nm narrow band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can process Hubble images by astronomical post processing software. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtra narrowband SIICCD3nm filter  (Sulful II for CCD) is designed for nebula observation allowing 3nm bandwidth of light  centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eH-Alpha 3nm filter is the popular narrowband filter allowing 3nm bandwidth of light centered on a wavelength of 656nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure vapor lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow). Better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtra narrowband OIII-CCD 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission line, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernoval remnants are taken only with H-Alpha and OIIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eGive you higher contrast and greater detailed viewing;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDecrease background noise and improve the contrast of objects;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIncrease the faint nebula signal and make i tto be brightness;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWith narrow band fitlers kit, you are able to process a hubble image;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThrough the optimization of the sustrate and upgrading of coating technology.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReference Spectrum\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The BLUE line shows the transmission of OIII3nm.The H-Alpha 3nm line is showen in GREEN. And the SII 3nm filter line is shown in RED. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003e\u003cspan\u003e\u003cstrong\u003eOptolong SHO-3nm Narrowband Filters Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅡ.\u003cu\u003e Pacman Nebula NGC 281 in the Hubble Palette  © \u003ca href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003eLuca Fornaciari Astrophotography  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePacman Nebula NGC 281 in the Hubble Palette\u003cbr\u003eWith the bad weather persisting I have taken these last few weeks to experiment with new way in the development of narrowband shots.\u003cbr\u003eI'm happy because I'm defining a Hubble Palette that really feels mine, designing it a little at a time.\u003cbr\u003eNarrowband is creative and fun because it allows us a good deal of freedom to experiment with the integration of the individual channels and the image you see is a developing version of what I am building.\u003cbr\u003eThe image was obtained with the new 3nm Optolong filters. If the bad weather will allow me a few nights I will soon finish my tests on these filters, but for now the impressions are really good.\u003cbr\u003e240 minutes of Ha, 510 of OIII and 260 minutes of SII with the ASI 294MM and the Sky-Watcher 300 f\/4.\u003cbr\u003eI wish you a beautiful sunny day!\u003cbr\u003eSETUP:\u003cbr\u003eSky-Watcher 300 f \/ 4 on EQ8R-Pro\u003cbr\u003eZWO ASI 294MM, \u003cstrong\u003eOptolong Filters Ha 3nm, OIII 3nm, SII 3nm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cu\u003eNebulose Nord America  © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTest dei nuovi filtri Optolong Astronomy Filter H alpha e OIII a 3nm (non ancora sul mercato) sotto cieli inquinati (Bortle 8\/9), con camera a colori e diametro limitato.\u003cbr\u003eElaborazione basica, senza considerare il colore delle stelle.\u003cbr\u003ePurtroppo il meteo mi ha concesso circa 3 ore per canale, manca ancora l'SII per comporre l'Hubble palette, spero di poter terminare la prossima settimana.\u003cbr\u003eLights: \u003cstrong\u003e12x900s (Ha 3nm) + 20x600s (OIII 3nm)\u003c\/strong\u003e\u003cbr\u003eTelescope: Takahashi FS-60CB + Reducer 0,72x\u003cbr\u003eCamera: QHY 168C\u003cbr\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC   \u003c\/span\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Optolong","offers":[{"title":"2\" Mounted","offer_id":45597752197379,"sku":"AT200025","price":1199.0,"currency_code":"USD","in_stock":false},{"title":"36mm Unmounted","offer_id":45597752230147,"sku":"AT200026","price":960.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/c9fc7c9e44b9926683acf8bcce9ecdb3.png?v=1776207935"},{"product_id":"optolong-sho-7nm-3-filter-set","title":"Optolong SHO 7nm (3 Filter Set)","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eSHO6.5nm filter kit includes SII6.5nm, H-Alpha7nm, and OIII6.5nm narrow-band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel . Corresponding with RGB channel (Ha, OIII, SII), photographers can process Hubble images by astronomical post processing software.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOptolong SHO-3nm Narrowband Filters Introduction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong SHO6.5nm filter kit includes SII6.5nm, H-Alpha7nm, and OIII6.5nm narrow-band filters, generally working with astronomical monochrome cooling CCD and modified DSLR  imaging in each single-channel . Corresponding with RGB channel (Ha, OIII, SII), photographers can process Hubble images by astronomical post processing software .\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtra narrowband SIICCD 6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 12nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eH-Alpha 7nm filter is the popular narrowband filter allowing 7nm bandwidth of light centered on a wavelength of 656nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Better choice of narrowband H-alpha astrophotography filter for highest contrast and revealing subtle nebula details.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtra Narrowband OIII-CCD 6.5nm filter is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernova remnants are taken only with H-alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGive you higher contrast and greater detailed viewing;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDecrease background noise and improve the contrast of objects;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIncrease the faint nebula signal and make it to be brightness;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith narrow band filters kit, you are able to process a hubble image;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThrough the optimization of the substrate and upgrading of coating technology, significantly improved the halo around the stars, especially in O3.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReference Spectrum\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/3427717cb1f3057669a8ab02ddfd6cd6.png?v=1718675077\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The BLUE line shows the transmission of OIII3nm.The H-Alpha 3nm line is showen in GREEN. And the SII 3nm filter line is shown in RED. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":45597805183235,"sku":"AT200015","price":465.0,"currency_code":"USD","in_stock":true},{"title":"2\" Mounted","offer_id":45597789683971,"sku":"AT200016","price":669.0,"currency_code":"USD","in_stock":false},{"title":"36mm Unmounted","offer_id":45597789716739,"sku":"AT200018","price":549.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/60e8e8b1d693d164903efb00e5081b46.jpg?v=1718675077"},{"product_id":"optolong-l-para-2-dual-band-filter","title":"Optolong L-Para 2\" Dual-band Filter","description":"\u003cp\u003eL-Para is a brand new dual narrowband 10nm light pollution filter. The FWHM of L-Para is 10nm for OIII (500.7nm) and H-Alpha (656.3nm) respectively. The transmittance of nebulae emission lines are both greater than 85% in system with focal ratios of F2 and above. It effectively filters out mercury lamp, sodium lamp, and LED light pollution emission lines.\u003c\/p\u003e\n\u003cp\u003eAt the same time, it has excellent contrast and anti-halo characteristics, allowing you to capture detailed and vivid nebula images. L-Para is suitable for both normal optical systems and fast optical systems, such as RASA and Hyperstar systems. \u003cbr\u003eEven when light is incident at an oblique angle, it can still maintain high transmission rates to provide you with a clear and precise shooting experience.\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBroad Compatibility: A dual narrowband filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLight Pollution Resistance: Effectively cuts off emission lines from mercury lamps, sodium lamps, LEDs, and other light pollution sources, making it applicable to Bortle Scale1- 7 dark skies. \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh Transmission Rate: In systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, resulting in higher imaging efficiency.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExcellent Contrast: The high transmittance of nebula emission lines (OIII \u0026amp; Ha) combined with deep cut-off of light pollution bands significantly improves image contrast and detail richness.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAnti-Halo Characteristics: The design has undergone several round of optimizations and many times of repeated testing ,resulting in a marked improvement in anti-halo performance, enhancing the capture of bright stars.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":46233372295427,"sku":"l-para","price":259.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/1_a99bbb53-db4d-441f-86a4-c6511f0328c3.png?v=1734542396"},{"product_id":"optolong-l-synergy-filter","title":"Optolong L-Synergy Filter","description":"\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e***\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e \u003cspan style=\"color: rgb(0, 0, 0);\"\u003ePut simply, the L-Synergy filter is \u003c\/span\u003e\u003cem\u003efor more-advanced users\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e \u003c\/span\u003e\u003c\/em\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003ewho want to shoot \u003cem\u003enebula\u003c\/em\u003e images in a true Hubble \"SHO\" palette with their one-shot color camera. \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTo do this, you'd combine two image stacks—one exposed through the L-Synergy, and the other exposed through Optolong's L-eXtreme filter. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"background-color: rgb(230, 230, 230); color: rgb(64, 64, 64);\"\u003e\u003cstrong\u003e**Need BOTH filters? Get the L2 Dual-Combo set instead, \u003cspan style=\"color: rgb(0, 170, 255);\"\u003e\u003ca href=\"https:\/\/milehighastro.com\/products\/optolong-l2-dual-combo-set-l-extreme-l-synergy-for-sho-images\" title=\"L2 Dual-Combo Filter Set\" style=\"background-color: rgb(230, 230, 230); color: rgb(0, 170, 255);\"\u003eHERE\u003c\/a\u003e\u003c\/span\u003e.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Optolong L-Synergy is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with an F-ratio of f\/3.3 or above (i.e., slower systems). Its key advantage lies in enabling astrophotographers to capture narrowband Sulphur wavelengths, along with some \"extra\" Oxygen-III light. \u003cstrong\u003eIn combination with the Hydrogen-Alpha and Oxygen-III emissions provided by an L-eXtreme filter that you may already be using, the result of stacking the light from both filters is the famous \"SHO,\" or \"Hubble Palette,\" as seen in many deep-space images of \u003c\/strong\u003e\u003c\/span\u003e\u003cstrong\u003enebulae. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eL-Synergy precisely captures the SII and OIII found in nebula colors, while filtering out the majority of other colors, including light pollution. Optically optimized, L-Synergy maintains consistently high transmission across both SII and OIII bands, delivering optimal astrophotography results.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20250924\/2b383de22cb607feeca255a89118e02d.png\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e*We will continue to optimize the product based on test results. This curve does not represent final product specifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Precision and homogeneity of the coatings ensures high transmission of the desired passbands and efficient removal of other wavelengths.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h5\u003e\n\u003cdiv title=\"Page 3\" class=\"page\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSubustrate \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eB270 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eThickness \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e1.85mm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eFWHM \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eO3 7nm+Ha 7nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking range \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e300-1000nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking depth \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003elight pollution lines blocked \u0026gt;99.9% \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSurface quality \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e60\/40 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront RMS: \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eλ\/4 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eParallelism \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e30''\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"2\"","offer_id":47297745649923,"sku":"lsynergy-2.0","price":309.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/560c9c074cc1b2c2b65878008382fbc3.jpg?v=1760474989"},{"product_id":"optolong-l2-dual-combo-set-l-extreme-l-synergy-for-sho-images","title":"Optolong L2 Dual-Combo Set (L-eXtreme \u0026 L-Synergy) for SHO images","description":"\u003cdiv title=\"Page 2\" class=\"page\"\u003e\n\u003cdiv class=\"section\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWhat is the L2 Dual-Combo Set?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eL2 Dual-Combo Set includes \u003cem\u003etwo\u003c\/em\u003e premium filters: \u003cstrong\u003eone L-eXtreme\u003c\/strong\u003e and \u003cstrong\u003eone L-Synergy\u003c\/strong\u003e. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"background-color: rgb(230, 230, 230);\"\u003e\u003cstrong\u003e**Already have a 2\" L-eXtreme? Get \u003cem\u003ejust the L-Synergy\u003c\/em\u003e \u003ca style=\"background-color: rgb(230, 230, 230);\" href=\"https:\/\/milehighastro.com\/products\/optolong-l-synergy-filter\" title=\"L-Synergy filter\"\u003eHERE\u003c\/a\u003e.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL-eXtreme: \u003c\/strong\u003eThe L-eXtreme is a dual-narrowband filter (7nm) designed to exclusively \u003cstrong\u003etransmit the key nebula emission lines of OIII (500.7nm) and Hα (656.3nm)\u003c\/strong\u003e. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL-Synergy: \u003c\/strong\u003eThe L-Synergy is a dual-narrowband filter (7nm) that provides \u003cstrong\u003ehigh transmission for both the SII (672.4nm) and OIII (500.7nm) spectral lines\u003c\/strong\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWhat is the L2 Dual-Combo Set?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe L2 Dual-Combo Set is engineered to unleash the power of the Hubble Palette (also known as \"SHO\" imaging) for color camera users, supporting telescope systems as fast as F3.3 and above (i.e., slower systems).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTailored specifically for \u003cem\u003eastrophotographers with one-shot color cameras\u003c\/em\u003e, this set includes two premium filters: OIII \u0026amp; Hα (L-eXtreme), OIII \u0026amp; SII (L-Synergy).\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis innovative combination breaks through the traditional limitations of shooting one-shot color cameras with narrowband imaging. With just \u003cem\u003etwo\u003c\/em\u003e filters, users can achieve stunning Hubble Palette images at a fraction of the cost and complexity of more traditional, three-filter approaches using monochrome cameras.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe L2 Dual-Combo Set captures the distinct colors of nebulae radiating in OIII, Hα, and SII light, while filtering out the vast majority of light pollution. Its transmission profile is as follows: \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/19ce3d5664886f96373832d4be8e8830.png?v=1760475338\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Precision and homogeneity of coatings ensuring high transmission of desired passbands, and efficient removal of other, unwanted, colors. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv title=\"Page 3\" class=\"page\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSubustrate \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eB270 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eThickness \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e1.85mm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eFWHM \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eO3 7nm+Ha 7nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking range \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e300-1000nm \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking depth \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003elight pollution lines blocked \u0026gt;99.9% \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eSurface quality \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e60\/40 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront RMS: \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eλ\/4 \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003eParallelism \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cspan\u003e30''\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlastic PP Case\u003c\/li\u003e\n\u003cli\u003eImported High Pressure EVA Case Lining\u003c\/li\u003e\n\u003cli\u003eSilver Cardboard Box\u003c\/li\u003e\n\u003cli\u003eHigh Density Sponge Carton Lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 2”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"2\"","offer_id":47299653075203,"sku":"L2 Dual-Combo Set","price":569.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/625ce0ff357eae9d0cd02396e639a230.jpg?v=1760475408"},{"product_id":"optolong-lrgb-sho-7nm-7-pieces","title":"Optolong LRGB + SHO 7nm (7 pieces)","description":"\u003cp\u003eComplete mono imaging filter set - Luminance, Red, Green, Blue + Sodium, Hydrogen, and Oxygen filters. 7 filters in total.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eThe LRGB telescope filter Kit\u003c\/strong\u003e is designed for maximum contrast and with extremely high gradients for clear differentiation of colors of light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis set divides the spectrum into its components:  red, green, blue and luminance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. Gap between green and red filters serves to block out the primary Sodium light pollution line at 589 nm and improves color balance and separation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eWorks well with debayered monochrome CCD cameras\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for deep sky and planetary CCD imaging\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRGB-imaging allows equal weighting factors for each channel, which is very important for automated imaging.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe ideal raw material for image processing in the sRGB color space is available with LRGB filter set and a mono CCD camera. \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSchott substrate material\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThickness 2.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over both surfaces\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e95% transmission at bandpass\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInfrared wavelength 700 to 1100 nm cut-off\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePrecision off-band blocking\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTavg: T\u0026gt;95%\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCoating Wavelength: 300-1050nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptical Density: OD3\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Parameter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMulti-layered anti-reflection coatings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNon-cemented optical substrate coatings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength); no deviation affected by temperature change\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eUltra-thin filter cell minimizes vignetting by maximizing the possible clear aperture (clear aperture is 26 mm for 1.25-inch; 45 mm for 2-inch)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAerometal Material\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePrecise CNC Machining\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSand Blasting Process\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBlack Anodized Finish\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eExtinction Treatment to Prevent Reflection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLaser Engraving No Fading\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOptolong SHO-3nm Narrowband Filters Introduction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong SHO-3nm filter kit includes SII 3nm, H-Alpha 3nm, and OIII 3nm narrow band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can process Hubble images by astronomical post processing software. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtra narrowband SIICCD3nm filter  (Sulful II for CCD) is designed for nebula observation allowing 3nm bandwidth of light  centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eH-Alpha 3nm filter is the popular narrowband filter allowing 3nm bandwidth of light centered on a wavelength of 656nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure vapor lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow). Better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtra narrowband OIII-CCD 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission line, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernoval remnants are taken only with H-Alpha and OIIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGive you higher contrast and greater detailed viewing;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDecrease background noise and improve the contrast of objects;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIncrease the faint nebula signal and make i tto be brightness;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith narrow band fitlers kit, you are able to process a hubble image;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThrough the optimization of the sustrate and upgrading of coating technology.\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":47451693416707,"sku":"AT200028","price":665.0,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":48068783669507,"sku":"AT200029","price":1099.0,"currency_code":"USD","in_stock":false},{"title":"36mm Unmounted","offer_id":48068785733891,"sku":"AT200031","price":775.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/lrgb-sho-2in.png?v=1763348563"}],"url":"https:\/\/milehighastro.com\/collections\/filters\/astro-days.oembed","provider":"Mile High Astronomy","version":"1.0","type":"link"}