{"product_id":"used-optolong-l-pro-light-pollution-broadband-filter-9","title":"Used Optolong L-Pro Light Pollution Broadband Filter 2\"","description":"\u003cp\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cp\u003eThis is a used Optolong 2\" L-Pro filter in excellent condition. There are no sleeks, dings, or marks, and the optics are completely clean. It comes in its original jewel case and box.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e(Any dust you see in the photos is easily removable - it seems that these filters develop an electrostatic charge such that the dust in the air is just attracted to the filter.)  \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\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\u003cp\u003e \u003c\/p\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\u003cp\u003e \u003c\/p\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. Cut out the interference areas of picture. 2.By post processing via RAW (video tutorials: \u003c\/span\u003e\u003ca href=\"https:\/\/youtu.be\/aDqCN5lu9PM\"\u003ehttps:\/\/youtu.be\/aDqCN5lu9PM\u003c\/a\u003e\u003cspan\u003e).\u003c\/span\u003e\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTpeak: T\u0026gt;90%\u003c\/li\u003e\n\u003cli\u003eSpectrum: 380-750nm\u003c\/li\u003e\n\u003cli\u003eOptical Density:  Light pollution emission is blocked 90%\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront RMS: 1\/4\u003c\/li\u003e\n\u003cli\u003eParallelism (arcsec): 30s\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\u003eOptically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over the 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\u003cbr\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\u003eClip Filters for crop sensors and full frame sensors\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":48441790628099,"sku":"U2606-BB-10202","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/8fdcd7ea-3aaa-4acd-8c43-ccb43b3923ab.jpg?v=1781985168","url":"https:\/\/milehighastro.com\/products\/used-optolong-l-pro-light-pollution-broadband-filter-9","provider":"Mile High Astronomy","version":"1.0","type":"link"}