{"product_id":"baader-planetarium-uv-ir-cut-l-filter-cmos-optimized","title":"Baader Planetarium UV\/IR-Cut \/ L-Filter – CMOS-optimized","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eServes as a high-transmission Luminance (L) filter\u003c\/li\u003e\n\u003cli\u003eProvides complete Ultraviolet (UV) and Infrared (IR) blocking\u003c\/li\u003e\n\u003cli\u003eEngineered with CMOS-optimized anti-reflection coatings\u003c\/li\u003e\n\u003cli\u003eAvailable as 31, 36, 47.4 \u0026amp; 50.4 mm round or 50x50 \u0026amp; 65x65 mm square unmounted filters\u003c\/li\u003e\n\u003cli\u003eFor compatible filter wheels and drawers, and the Baader FCCT (Filter Changer \u0026amp; Camera Tilter)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eUV\/IR-Cut \/ L-Filter – CMOS-optimized\u003c\/h2\u003e\n\u003cp\u003eThe Baader UV\/IR-Cut \/ L-Filter is a specialized unmounted filter designed to serve as the primary luminance channel for modern CMOS cameras. Available in round (31 mm, 36 mm, 50.4 mm, and 47.4 mm for the Baader FCCT system) and square (50x50 mm and 65x65 mm) formats, this filter provides a clean, high-transmission visible spectrum signal by strictly blocking unwanted ultraviolet and infrared wavelengths that cause bloated stars and soft focus in sensitive imaging systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA True Luminance Filter: Blocking UV\/IR for CMOS Sensors\u003c\/h3\u003e\n\u003cp\u003eModern CMOS sensors are highly sensitive to light outside the visible spectrum, particularly in the near-infrared. Without a proper cut-off filter, this IR sensitivity leads to bloated, unfocused stars and a significant loss of resolution. This filter acts as a true luminance filter, transmitting the desired visible light while completely blocking UV and IR, ensuring your refractor's color correction is maintained and stars remain sharp.\u003c\/p\u003e\n\u003cp\u003eThe \"CMOS-optimized\" designation refers to its advanced anti-reflection coatings. These are engineered to eliminate the halos and internal reflections that can occur between the flat, reflective surface of a CMOS sensor and the filter glass, keeping bright stars like Vega or Sirius artifact-free.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUnmounted Round and Square Formats, Including Baader's FCCT System\u003c\/h3\u003e\n\u003cp\u003eEvery size is supplied unmounted: 31 mm and 36 mm round filters for filter wheels made for those sizes, 50.4 mm round and 50x50 mm or 65x65 mm square filters for large filter wheels and drawers serving full-frame or larger sensors, and a precise 47.4 mm diameter for direct and secure installation into the Baader FCCT (Filter Changer \u0026amp; Camera Tilter). This unmounted design is critical for minimizing the optical path length, a key factor in achieving focus with complex imaging trains that include correctors or reducers.\u003c\/p\u003e\n\u003cp\u003eIntegrated directly into the FCCT, the 47.4 mm filter becomes a core part of a rigid, tilt-corrected imaging system, while the large round and square sizes keep the light path unobstructed for big sensors. Both avoid the potential for flexure, vignetting, or clearance issues that can arise from stacking traditional threaded filter cells, ensuring a stable and optimized light path from the telescope to your camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUnmounted Filters vs. Standard 2\" Mounted Filters: A System Approach\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 2\" mounted filter offers broad compatibility, an unmounted filter provides superior integration in filter wheels, drawers and systems built for its exact size. The primary trade-off is versatility for optimization.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2\" Mounted Filter:\u003c\/strong\u003e Housed in a threaded cell (M48x0.75), it can be used in any standard 2\" filter wheel or drawer. However, this cell adds several millimeters to the back focus consumption.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader Unmounted UV\/IR-Cut \/ L-Filter:\u003c\/strong\u003e By removing the housing, it consumes the minimum possible back focus. Each size needs a holder made for it – the 47.4 mm version is designed exclusively for the Baader FCCT, ensuring perfect fit, centering, and parfocality within that system – and no version can be used in standard threaded 2\" filter holders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Baader UV\/IR-Cut \/ L-Filter supplied unmounted?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter is unmounted to integrate directly into filter wheels, drawers and carriers made for its size – including the Baader FCCT (Filter Changer \u0026amp; Camera Tilter) for the 47.4 mm version. This design minimizes the consumption of precious back focus, reduces potential vignetting, and ensures a rigid, stable optical path without the added length and mechanical complexity of a standard threaded filter cell.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"CMOS-optimized\" mean for this UV\/IR-Cut filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eCMOS-optimized\u003c\/strong\u003e means the filter features advanced anti-reflection coatings designed to prevent halos and other artifacts caused by reflections between the filter and the highly reflective surface of a CMOS sensor. This is especially important for maintaining clean, high-contrast images of fields containing bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich size do I need, and will it fit a standard 2\" filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAll versions are unmounted, so none will fit a standard filter wheel drawer or carousel designed for threaded M48 (2\") mounted filters. Choose the size your holder accepts: \u003cstrong\u003e31 mm or 36 mm\u003c\/strong\u003e round for wheels made for those diameters, \u003cstrong\u003e50.4 mm\u003c\/strong\u003e round or \u003cstrong\u003e50x50 mm \/ 65x65 mm\u003c\/strong\u003e square for large filter wheels and drawers used with full-frame or larger sensors, and \u003cstrong\u003e47.4 mm\u003c\/strong\u003e exclusively for the Baader FCCT system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I'm imaging the Pleiades (M45) with a refractor, how does this L-filter help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen imaging a reflection nebula like the Pleiades (M45), the bright blue stars are strong sources of UV and IR light. This filter blocks that out-of-band light, which refractors cannot bring to the same focal point as visible light. The result is significantly tighter stars, sharper detail in the faint nebulosity, and the prevention of \"blue bloat\" that can overwhelm the image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this filter benefit imaging the Andromeda Galaxy (M31) with an SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a broadband target like the Andromeda Galaxy (M31), this filter serves as your high-transmission luminance channel. Its strict UV\/IR blocking is critical for SCTs, which often use corrector plates that are not optimized for these wavelengths. By isolating the visible spectrum, you achieve a much sharper luminance frame with better contrast between the galaxy's core, dust lanes, and faint outer arms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this filter only for monochrome cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is designed primarily as a luminance (L) filter for monochrome LRGB imaging. It can also help a color CMOS camera that lacks a sufficient built-in IR-cut filter, where the missing IR blocking leads to a reddish cast and bloated stars. If your color camera already has a UV\/IR-cut window in front of the sensor, adding this filter usually brings little additional benefit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e2\" Round Unmounted Filter (Ø 47.4mm, FCCT)\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR Cut \/ Luminance (L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\" (Ø 47.4 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eUnmounted Round\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eBaader FCCT (Filter Changer \u0026amp; Camera Tilter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection, CMOS-Optimized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e31mm Round Unmounted Filter\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR Cut \/ Luminance (L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e31 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eUnmounted Round\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection, CMOS-Optimized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eLRGB Astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e36mm Round Unmounted Filter\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR Cut \/ Luminance (L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eUnmounted Round\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection, CMOS-Optimized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eLRGB Astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e50.4mm Round Unmounted Filter\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR Cut \/ Luminance (L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e50.4mm Round, Unmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection, CMOS-Optimized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eLRGB Astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e50x50mm Square Filter\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eLuminance (UV\/IR-Cut)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e50 x 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eUnmounted Square\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eCMOS-Optimized, Anti-Reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e65x65mm Square Filter\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR Cut \/ Luminance (L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e65x65 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eUnmounted Square\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eCMOS-Optimized, Anti-Reflective\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Cleaning_and_Maintenance_of_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Filter_Problems_FAQ_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"2\" Round Unmounted Filter (Ø 47.4mm, FCCT)","offer_id":52913207247133,"sku":"BAA-2961573U","price":136.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted Filter","offer_id":52913207279901,"sku":"BAA-2961571","price":101.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted Filter","offer_id":52913207312669,"sku":"BAA-2961572","price":116.0,"currency_code":"CAD","in_stock":true},{"title":"50.4mm Round Unmounted Filter","offer_id":52913207345437,"sku":"BAA-2961574","price":197.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Filter","offer_id":52913207378205,"sku":"BAA-2961575","price":255.0,"currency_code":"CAD","in_stock":true},{"title":"65x65mm Square Filter","offer_id":52913207410973,"sku":"BAA-2961576","price":357.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-FCCT-Filter-UV-IR-Cut-L-Filter-2-unmounted-47-4-mm-CMOS-optimized-1_45bc1a90-67c0-48dd-be2c-1eea6ddcfb16.jpg?v=1789088132","url":"https:\/\/davidastro.com\/products\/baader-planetarium-uv-ir-cut-l-filter-cmos-optimized","provider":"David Astro","version":"1.0","type":"link"}