{"product_id":"used-antlia-alp-t-f-2-high-speed-dual-narrowband-h-a-5nm-o-iii-5nm-filter-2","title":"Used Antlia ALP-T f\/2 High Speed Dual Narrowband H-a (5nm) \u0026 O-III (5nm) Filter - 2\"","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e:\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThis is a used Antlia ALP-T 2\" Dual Narrowband (5nm) filter in very good condition. \u003c\/span\u003e\u003cspan\u003eThe optics are relatively clean, with only some minor dust spots, and the body is unmarked. This filter is the high speed \u003c\/span\u003e\u003cspan\u003e(f\/2) version.  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis comes in its original jewel case.  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e    \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch5\u003eDescription\u003cmeta charset=\"utf-8\"\u003e\n\u003cimg src=\"https:\/\/starizona.com\/cdn\/shop\/products\/OIII500.7nmforfastoptics_1220x774.png?v=1648769552\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cimg src=\"https:\/\/starizona.com\/cdn\/shop\/products\/H-alpha656.3nmforfastoptics_1219x774.png?v=1648769552\"\u003e\n\u003c\/h5\u003e\n\u003cdiv\u003e\n\u003cp\u003eALP-T Dual Band 5nm Ha \u0026amp; OIII Highspeed Filters # ALP-T-2-HS are further optimized to work with high-speed imaging systems by shifting slightly the passband and center wavelength. Using these highspeed filters between optics f\/2.2 and f\/3.6 shows much stronger and more contrasted in nebulae imaging compared to the standard version.\u003c\/p\u003e\n\u003cp\u003eFor optics f-ratios slower than f\/3.6, the standard ALP-T Dual Band 5nm filter is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f\/3.6, the highspeed version is the best choice.\u003c\/p\u003e\n\u003cp\u003eBut keep in mind, the blue shift data by the computer simulation indicates narrowband filter shifts its bandwidth to shorter wavelengths with faster optics than f\/2, transmission at the emission wavelength may decrease perhaps 15%-20%. Although the Antlia ALP-T highspeed filter has similar transmission rates reduction in the H-a and OIII when the filter is used on fast optics, based on current standard version users’ data, it is evident that the filter still has the high performance of increase in emission nebula contrast and minimized halo.\u003c\/p\u003e\n\u003cp\u003eThe Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on our ALP-T ultra dual band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD) 4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned especially for fast astronomy optics, in particular f-ratios f\/2.2 to f\/3.6\u003c\/li\u003e\n\u003cli\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD) 4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1050nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003eHydrogen-alpha\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength): 657.8nm\u003c\/li\u003e\n\u003cli\u003ePeak Transmission: 88%\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1050nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eOxygen III\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength): 502.2nm\u003c\/li\u003e\n\u003cli\u003ePeak Transmission: 82%\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1050nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":49163784388867,"sku":"U2607-MS-ANTLIA-ALP-T-2","price":275.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/21b1257a-60eb-44dd-aa76-dc0f62bcc0c8.jpg?v=1783121633","url":"https:\/\/milehighastro.com\/products\/used-antlia-alp-t-f-2-high-speed-dual-narrowband-h-a-5nm-o-iii-5nm-filter-2","provider":"Mile High Astronomy","version":"1.0","type":"link"}