{"title":"UV\/IR, Clear \u0026 Specialty Filters","description":null,"products":[{"product_id":"chroma-clear-filter","title":"Chroma Clear Filter","description":"\u003c!-- more --\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"back reflections\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967248822557,"sku":"CT-27044-1.25M","price":182.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967248855325,"sku":"CT-27044-31D","price":182.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967248888093,"sku":"CT-27044-36D","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967248920861,"sku":"CT-27044-2M","price":525.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967248953629,"sku":"CT-27044-50D","price":455.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967248986397,"sku":"CT-27044-50X50","price":490.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Clear-Filter__90054.1596071523.1280.1280.jpg?v=1684339522"},{"product_id":"baader-acf-dslr-astro-conversion-filter-for-canon-eos-300","title":"Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for Canon EOS 300 DSLR Astro-Conversion\u003c\/li\u003e\n\u003cli\u003eDramatically Improved Spectral Transmission for Astrophotography\u003c\/li\u003e\n\u003cli\u003eUnlocks Critical Hydrogen-Alpha (Hα) Wavelengths\u003c\/li\u003e\n\u003cli\u003ePlane-Optically Polished for Maximum Image Fidelity\u003c\/li\u003e\n\u003cli\u003eReplaces the Camera's Stock Internal Filter\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\u003eBaader ACF DSLR Astro Conversion Filter - for Canon EOS 300\u003c\/h2\u003e\n      \u003cp\u003eThe Baader ACF 1 Astro Conversion Filter is engineered specifically for the Canon EOS 300, replacing the stock internal filter to dramatically improve spectral transmission for astrophotography. This plane-optically polished filter is the key to unlocking the deep-red hydrogen-alpha wavelengths essential for capturing the true structure and extent of emission nebulae.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eUnlocking H-alpha: The Purpose of the Baader ACF Filter\u003c\/h3\u003e\n      \u003cp\u003eA standard DSLR camera's internal filter is designed to block infrared light and a significant portion of the deep-red spectrum to produce pleasing daytime images. This same filter, however, aggressively cuts off the 656nm Hydrogen-alpha line, which is the dominant wavelength emitted by the vast majority of nebulae. The Baader ACF filter corrects this by replacing the stock filter with one that has an \"astro-tuned\" transmission curve, allowing this vital wavelength to reach your camera's sensor.\u003c\/p\u003e\n      \u003cp\u003eWith this filter installed, your Canon EOS 300 can capture the faint, glowing hydrogen gas in objects like the North American Nebula (NGC 7000) or the Rosette Nebula (NGC 2244), revealing details and structures that are simply invisible to an unmodified camera.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003ePlane Optical Polishing: Maintaining Image Sharpness\u003c\/h3\u003e\n      \u003cp\u003eInserting any filter into an optical path risks degrading the image, but the Baader ACF filter is manufactured to prevent this. It is plane-optically polished to a high standard, ensuring it does not introduce astigmatism, blur, or other aberrations into your images. This preserves the sharpness and resolution delivered by your telescope or camera lens.\u003c\/p\u003e\n      \u003cp\u003eThis level of optical quality means your stars remain tight, round points from edge to edge. The filter's only job is to alter the spectral transmission, not the geometric accuracy of the light cone, ensuring your final images are as sharp as your optics can deliver.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eStock vs. Astro-Modified: What the ACF Filter Changes for Your Canon EOS 300\u003c\/h3\u003e\n      \u003cp\u003eModifying your Canon EOS 300 with the Baader ACF filter fundamentally changes its behavior, turning it into a specialized instrument for astronomy. A stock camera will produce weak, muted reds when aimed at emission nebulae, often requiring extreme processing to show even a hint of structure. After modification, the H-alpha signal is dramatically stronger, making nebulae stand out with far less exposure time and noise.\u003c\/p\u003e\n      \u003cp\u003eThe primary trade-off is in daytime photography. The increased red sensitivity will shift the camera's color balance, requiring a custom white balance profile to produce natural-looking terrestrial images. For many, this modification dedicates the camera body to astrophotography, where its newfound sensitivity can be fully exploited.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of installing the Baader ACF Filter in my Canon EOS 300?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit is a massive increase in sensitivity to the \u003cstrong\u003eHydrogen-alpha (Hα) wavelength\u003c\/strong\u003e at 656nm. This allows your Canon EOS 300 to capture the faint, red light from emission nebulae, which is almost completely blocked by the camera's original factory filter.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Baader ACF Filter change my images of the Orion Nebula (M42) with my Canon EOS 300?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith an unmodified Canon EOS 300, the extensive outer loops of hydrogen gas in the Orion Nebula (M42) will appear faint and lack detail. After installing the Baader ACF filter, these structures will be significantly brighter and more defined in your exposures, revealing the full extent of the nebula with much greater contrast and color depth.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I still use my Canon EOS 300 for normal daytime photography after installing the Baader ACF filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, but with a critical adjustment. The increased red sensitivity will give daytime images a strong red cast. To correct this, you must create a \u003cstrong\u003ecustom white balance\u003c\/strong\u003e profile using a grey card. While usable, many astrophotographers choose to dedicate the modified camera body to astronomical use.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is \"plane optical polishing\" important for the Baader ACF conversion filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003ePlane optical polishing ensures the filter is perfectly flat and free of optical defects. This is crucial because a low-quality filter can distort the light path, leading to \u003cstrong\u003eblurred stars and loss of detail\u003c\/strong\u003e. Baader's polishing maintains the high-resolution performance of your telescope and lenses.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI use my Canon EOS 300 with an 80mm refractor. Will the Baader ACF filter introduce any optical problems?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. Because the Baader ACF filter is plane-optically polished, it will not introduce any new aberrations like astigmatism or coma. It is designed to be optically transparent in terms of image geometry, so the sharp, high-contrast views from your 80mm refractor will be preserved.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs installing the Baader ACF filter a simple process?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eInstalling a DSLR conversion filter is a delicate and complex procedure that involves disassembling the camera body in a dust-free environment. It carries a risk of damaging the sensor or camera electronics. We strongly recommend having the \u003cstrong\u003einstallation performed by an experienced professional\u003c\/strong\u003e.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003eother\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003erectangular\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eColor Correction, H-alpha, IR-Cut, UV-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003e400 – 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\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":"Default Title","offer_id":44967355842845,"sku":"BAA-2459211","price":124.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-ACF-DSLR-Astro-Conversion-Filter-for-Canon-EOS-300-1__99449.1597110898.1280.1280.jpg?v=1684340980"},{"product_id":"baader-acf-dslr-astro-conversion-filter-for-canon-eos-350d-10d-20d-30d","title":"Baader ACF DSLR Astro Conversion Filter - for Canon EOS 350D\/10D\/20D\/30D","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for Canon EOS 350D, 10D, 20D, and 30D DSLRs\u003c\/li\u003e\n\u003cli\u003eImproves Spectral Transmission for Astrophotography\u003c\/li\u003e\n\u003cli\u003eUnlocks Sensitivity to Hydrogen-Alpha (Hα) Nebulae\u003c\/li\u003e\n\u003cli\u003ePlane-Optically Polished to Maintain Image Sharpness\u003c\/li\u003e\n\u003cli\u003eReplaces the Camera's Stock Internal Low-Pass Filter\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\u003eBaader ACF DSLR Astro Conversion Filter - for Canon EOS 350D\/10D\/20D\/30D\u003c\/h2\u003e\n\u003cp\u003eThe Baader ACF DSLR Astro Conversion Filter is a direct replacement for the stock low-pass filter in Canon EOS 350D, 10D, 20D, and 30D cameras. This plane-optically polished filter unlocks your DSLR's true deep-sky potential by providing improved spectral transmission, especially in the critical Hydrogen-alpha wavelength, turning a standard camera into a dedicated astronomical imaging tool.\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\u003eUnlocking H-Alpha for Deep-Sky Astrophotography\u003c\/h3\u003e\n\u003cp\u003eStandard DSLR cameras include an internal filter that aggressively blocks infrared light to ensure correct color balance for daytime photography. A side effect is that this filter also cuts off the vital 656nm Hydrogen-alpha line, the wavelength in which most emission nebulae shine brightest. The Baader ACF filter is engineered to replace the stock filter, providing a spectral window that allows this deep red light to reach your camera's sensor.\u003c\/p\u003e\n\u003cp\u003eBy installing this filter, you convert your camera into a powerful instrument for capturing faint, red nebulosity. Objects like the North American Nebula (NGC 7000) and the Rosette Nebula (NGC 2237), which are nearly invisible to an unmodified camera, will register with rich detail and contrast, revealing the vast hydrogen clouds that populate our galaxy.\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\u003ePlane-Polished Glass for Maintained Sharpness\u003c\/h3\u003e\n\u003cp\u003ePlacing any new optical element in a camera's light path carries the risk of degrading image resolution if not manufactured to high standards. Baader addresses this by ensuring the ACF filter is plane-optically polished. This process results in surfaces that are exceptionally flat and parallel, preventing any distortion of the focal plane.\u003c\/p\u003e\n\u003cp\u003eThis attention to optical quality means your stars remain pinpoint and fine details are preserved across the entire frame. The filter's purpose is to improve spectral response without compromising the sharpness your telescope and camera sensor are capable of delivering, ensuring your final images are both sensitive and sharp.\u003c\/p\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\"\u003eWhat is the purpose of the Baader ACF Astro Conversion Filter for my Canon 20D?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter replaces your Canon 20D's original internal filter, which blocks most of the red light from deep-sky nebulae. The Baader ACF filter allows this critical \u003cstrong\u003eHydrogen-alpha light\u003c\/strong\u003e to pass through, dramatically increasing your camera's sensitivity for astrophotography of emission nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill installing the Baader ACF filter change how my Canon 350D works for daytime photography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. After this modification, your camera's color balance will be strongly shifted toward red. While it's possible to correct this with a \u003cstrong\u003ecustom white balance\u003c\/strong\u003e, the camera is best considered a dedicated astronomy tool post-conversion. Autofocus with standard camera lenses may also be affected.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this Baader filter better than just removing the stock filter from my Canon 10D?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSimply removing the stock filter alters the camera's required back focus distance, making it impossible to reach infinity focus with many lenses and telescopes. The Baader ACF filter is a \u003cstrong\u003eplane-parallel replacement\u003c\/strong\u003e that maintains the correct optical path length, ensuring sharp focus while also protecting the exposed CMOS sensor from dust.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat objects will I image better with a Canon 30D modified with the Baader ACF filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will see the most significant improvement on \u003cstrong\u003eemission nebulae\u003c\/strong\u003e rich in Hydrogen-alpha. Expect stunning results on targets such as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe Orion Nebula (M42)\u003c\/li\u003e\n\u003cli\u003eThe Lagoon Nebula (M8)\u003c\/li\u003e\n\u003cli\u003eThe North American Nebula (NGC 7000)\u003c\/li\u003e\n\u003cli\u003eThe California Nebula (NGC 1499)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the installation of the Baader ACF DSLR Astro Conversion Filter reversible?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe modification requires careful disassembly of your DSLR. While it is technically possible to reverse the process if you save the original filter, it is a delicate and complex procedure that carries a significant risk of damaging the camera. For this reason, it is generally considered a \u003cstrong\u003epermanent modification\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"plane optically polished\" mean for the Baader ACF filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt means the filter's surfaces are manufactured to be extremely flat and perfectly parallel to each other. This is a critical quality feature that \u003cstrong\u003eprevents image degradation\u003c\/strong\u003e. It ensures the filter will not introduce any distortions or blur, preserving the full sharpness and resolution of your optical system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eDSLR Astro Conversion Filter (ACF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Cameras\u003c\/td\u003e\n\u003ctd\u003eCanon EOS 350D, 10D, 20D, 30D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Purpose\u003c\/td\u003e\n\u003ctd\u003eIncreases Hydrogen-Alpha (Hα) Sensitivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Quality\u003c\/td\u003e\n\u003ctd\u003ePlane-Optically Polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003eother\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003erectangular\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eColor Correction, H-alpha, IR-Cut, UV-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003e400 – 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader ACF DSLR Astro Conversion Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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_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\"\u003eBaader Planetarium Filter Problems FAQ 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":"Default Title","offer_id":44967355908381,"sku":"BAA-2459212","price":139.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-ACF-DSLR-Astro-Conversion-Filter-for-Canon-EOS-350D-10D-20D-30D-1__90920.1597110899.1280.1280.jpg?v=1684340982"},{"product_id":"baader-bcf-dslr-astro-conversion-filter-for-canon-eos","title":"Baader BCF DSLR Astro Conversion Filter - for Canon EOS","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReplaces stock DSLR filter to dramatically increase H-alpha sensitivity\u003c\/li\u003e\n\u003cli\u003eEnables detailed imaging of emission nebulae\u003c\/li\u003e\n\u003cli\u003eDesigned for a wide range of Canon EOS APS-C cameras\u003c\/li\u003e\n\u003cli\u003eMaintains correct focus with standard camera lenses\u003c\/li\u003e\n\u003cli\u003eA permanent modification for dedicated astrophotography use\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\u003eBaader BCF DSLR Astro Conversion Filter - for Canon EOS\u003c\/h2\u003e\n\u003cp\u003eThe Baader BCF DSLR Astro Conversion Filter replaces the stock IR-cut filter in Canon EOS models like the 7D, 40D, and 50D, dramatically increasing their sensitivity to the critical Hydrogen-alpha wavelength. This modification is essential for capturing the faint, red structures in emission nebulae like the North American Nebula (NGC 7000) that a standard DSLR sensor cannot record. It transforms compatible cameras, including the 60D, 600D, and 1100D, into capable deep-sky imaging instruments.\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\u003eUnlocking Hydrogen-Alpha for Deep-Sky Imaging\u003c\/h3\u003e\n\u003cp\u003eA standard DSLR camera is engineered for daytime photography, which requires filtering out the infrared and ultraviolet light that human eyes don't see. Unfortunately, this stock filter also blocks most of the deep-red Hydrogen-alpha light that is the primary emission from the most iconic nebulae. The Baader BCF is specifically designed to replace this restrictive filter, opening a new window for your camera's sensor.\u003c\/p\u003e\n\u003cp\u003eBy installing the BCF, you allow this crucial wavelength to reach the sensor, revealing the intricate details, faint extensions, and true color of targets like the Orion Nebula (M42) and the Lagoon Nebula (M8). This is not a subtle change; it is the fundamental step in converting a consumer camera into a serious astrophotography tool.\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\u003eCompatibility for Canon EOS 7D, 40D, 50D, 60D, and More\u003c\/h3\u003e\n\u003cp\u003eThis Baader BCF filter is engineered for a precise fit within the sensor assemblies of a wide range of popular Canon EOS DSLR bodies. It is a direct replacement for the original filter, ensuring that autofocus and infinity focus with standard camera lenses are maintained after the conversion.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported Models:\u003c\/strong\u003e Canon EOS 7D, 40D, 50D, 60D, 400D, 450D, 500D, 550D, 600D, 650D, 1000D, and 1100D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e Replacing the internal filter is a delicate, irreversible process that requires disassembling the camera body. This modification should only be undertaken if you are comfortable with intricate electronics work or by a professional service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Astro-Conversion Advantage: Baader BCF vs. a Stock DSLR Filter\u003c\/h3\u003e\n\u003cp\u003eThe difference between an image taken with a stock DSLR and one with a Baader BCF-modified camera is night and day, especially on emission nebulae. A stock camera will struggle to record anything more than the brightest core of a nebula, often with weak, muddy colors. The modified camera captures the full extent of the object's glowing hydrogen gas.\u003c\/p\u003e\n\u003cp\u003eWhile a dedicated astronomy camera offers cooling and monochrome capabilities, a modified DSLR is a powerful and cost-effective entry into serious deep-sky imaging. The Baader BCF provides the most critical part of that conversion: enhanced red sensitivity. After modification, your camera will still function for daytime use, but will require a custom white balance to correct the color cast.\u003c\/p\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\"\u003eWhat is the main benefit of installing the Baader BCF in my Canon EOS camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is a massive increase in sensitivity to the \u003cstrong\u003eHydrogen-alpha wavelength\u003c\/strong\u003e. This allows your Canon DSLR to capture the faint, red light from emission nebulae, which is almost completely blocked by the camera's stock filter, transforming it into a powerful tool for deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader BCF filter allow my Canon 60D to photograph the Orion Nebula (M42) better?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The Orion Nebula (M42) is rich in Hydrogen-alpha emissions. A standard Canon 60D will only capture the bright, central Trapezium region well, while the extensive outer loops of gas will appear faint and lack detail. With the Baader BCF installed, your 60D will record the full, vibrant red structure of the entire nebula complex.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAfter installing the Baader BCF filter, can I still use my Canon 450D for normal daytime photography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but with a critical adjustment. After the conversion, daytime images will have a strong red color cast. To correct this, you must shoot using a \u003cstrong\u003ecustom white balance\u003c\/strong\u003e setting. By taking a reference photo of a neutral gray or white card, you can create a white balance profile that produces natural-looking colors for terrestrial subjects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader BCF filter installation reversible?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically possible, the process is not considered easily reversible. It involves delicate disassembly of the camera and sensor assembly. It is best to consider this a \u003cstrong\u003epermanent modification\u003c\/strong\u003e dedicated to converting the camera for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Canon EOS models is the Baader BCF filter compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader BCF is designed for a range of Canon APS-C sensor DSLRs. Compatible models include the \u003cstrong\u003eCanon EOS 7D, 40D, 50D, 60D, 400D, 450D, 500D, 550D, 600D, 650D, 1000D, and 1100D\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does a Baader BCF-modified Canon 7D compare to a dedicated astronomy camera for imaging the Heart Nebula (IC 1805)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Baader BCF-modified Canon 7D will dramatically outperform a stock DSLR on the Heart Nebula (IC 1805), capturing its extensive H-alpha structures. However, a dedicated astronomy camera typically offers sensor cooling to reduce thermal noise during long exposures, which will result in a cleaner final image with better signal-to-noise ratio. The modified DSLR is a fantastic, cost-effective step up, while a cooled astro camera is the next level for ultimate image quality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003eother\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003erectangular\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eColor Correction, H-alpha, IR-Cut, UV-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003e400 – 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\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\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":"Default Title","offer_id":44967355941149,"sku":"BAA-2459213","price":114.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-BCF-DSLR-Astro-Conversion-Filter-for-Canon-EOS-7D-40D-50D-60D-400D-450D-500D-550D-600D-650D-1000D-1100D-1__19322.1597110900.1280.1280.jpg?v=1684340985"},{"product_id":"baader-clear-focusing-filter","title":"Baader Clear Focusing Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables precise focusing for dim narrowband filters\u003c\/li\u003e\n\u003cli\u003ePerfectly parfocal with other Baader Planetarium filters\u003c\/li\u003e\n\u003cli\u003eOptically polished to ensure no image degradation\u003c\/li\u003e\n\u003cli\u003eAvailable in multiple formats from 1.25\" mounted to 65x65mm square\u003c\/li\u003e\n\u003cli\u003eLPFC (Low Profile Filter Cell) on mounted versions for maximum compatibility\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\u003eBaader Clear Focusing Filter\u003c\/h2\u003e\n\u003cp\u003eThe Baader Clear Focusing Filter, available in multiple formats including 1.25\" and 2\" mounted cells and unmounted sizes up to 65x65mm, solves the most critical challenge of narrowband imaging: achieving perfect focus on a dim target. It is designed to be perfectly parfocal with Baader's line of imaging filters, allowing you to use a bright, full-spectrum star to achieve sharp focus before swapping to a restrictive line filter without any change in the focal point.\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\u003eThe Parfocal Solution for Dim Narrowband Filters\u003c\/h3\u003e\n\u003cp\u003eNarrowband filters transmit such a tiny fraction of the visual spectrum that focusing can be an exercise in frustration. Stars become too faint for autofocus routines or to produce clear spikes on a Bahtinov mask. The Baader Clear Focusing Filter eliminates this problem by providing a bright, full-spectrum view for focusing.\u003c\/p\u003e\n\u003cp\u003eBecause this clear filter is manufactured to the exact same optical thickness as Baader's narrowband, LRGB, and other imaging filters, the focal plane does not shift when you switch between them. You can achieve critical focus once with the clear filter and be confident that every subsequent narrowband exposure is perfectly sharp, saving valuable time and eliminating wasted sub-exposures.\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\u003eOptically Polished Glass for Pinpoint Focus Accuracy\u003c\/h3\u003e\n\u003cp\u003eThis is not simply a blank piece of glass; it is a high-quality optical window. Each Baader Clear Focusing Filter is optically polished to maintain the integrity of your light path, ensuring that the focus you achieve is true and not compromised by optical imperfections. This prevents any degradation of your final image resolution.\u003c\/p\u003e\n\u003cp\u003eThe 1.25\" and 2\" mounted versions feature Baader's Low Profile Filter Cell (LPFC), designed to prevent vignetting and fit easily into any standard filter wheel or drawer. For users with specific needs, the filter is also available in a wide range of unmounted sizes, from 31mm round to 65x65mm square, to accommodate nearly any imaging setup.\u003c\/p\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 do I need a Baader Clear Focusing Filter for narrowband imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNarrowband filters, like H-alpha or OIII, block almost all light, making stars extremely dim and difficult to focus on. The \u003cstrong\u003eBaader Clear Focusing Filter\u003c\/strong\u003e is parfocal (maintains the same focus point) with these filters. This allows you to focus on a bright star with a full-spectrum view, then swap to your narrowband filter without needing to refocus, ensuring perfect sharpness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader Clear Focusing Filter just an empty filter cell or blank glass?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. It is a high-quality optical window that has been \u003cstrong\u003eoptically polished\u003c\/strong\u003e to a high standard. This ensures it does not introduce any distortion or aberrations into your optical train. Using a non-polished piece of glass would compromise the critical focus you are trying to achieve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Clear Focusing Filter be parfocal with filters from other brands?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot necessarily. Parfocality depends on the precise mechanical thickness of the filter substrate. The \u003cstrong\u003eBaader Clear Focusing Filter\u003c\/strong\u003e is specifically designed to match the thickness of other Baader Planetarium filters. While it may be close with other brands, perfect parfocality is only guaranteed within the Baader 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 Pelican Nebula (IC 5070) in SII, how does the Baader Clear Focusing Filter help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eImaging the faint sulfur emissions of the Pelican Nebula requires long exposures through a very dim filter. Instead of struggling to focus on a faint star through the SII filter, you would use the \u003cstrong\u003eBaader Clear Focusing Filter\u003c\/strong\u003e to focus on a nearby bright star like Deneb. Once your focus is locked, you can swap to the SII filter in your filter wheel, slew to the nebula, and begin imaging, confident that your focus is perfect.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI use a filter drawer with a fast f\/4 Newtonian. Is the Baader Clear Focusing Filter still effective?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is especially effective with fast systems. Fast optics have a very critical focus zone, making precise focus even more important. The \u003cstrong\u003eBaader Clear Focusing Filter\u003c\/strong\u003e allows you to use all available light to nail that critical focus point, which is extremely difficult to do with a dim narrowband filter at f\/4. The parfocal design ensures that focus is maintained when you insert your imaging filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich size of the Baader Clear Focusing Filter do I need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe correct size depends on your filter wheel, filter drawer, or camera setup. The \u003cstrong\u003eBaader Clear Focusing Filter\u003c\/strong\u003e is available in several standard sizes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" and 2\" Mounted:\u003c\/strong\u003e For standard filter wheels and focusers that accept threaded filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e31mm and 36mm Round Unmounted:\u003c\/strong\u003e Common sizes for 1.25\" filter wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50.4mm Round, 50x50mm Square, and 65x65mm Square Unmounted:\u003c\/strong\u003e For larger filter wheels designed for full-frame and medium-format sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eClear Focusing Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Quality\u003c\/td\u003e\n\u003ctd\u003eOptically Polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eAchieving parfocal focus with narrowband and LRGB filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Formats\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted, 31mm Round Unmounted, 36mm Round Unmounted, 50.4mm Round Unmounted, 50x50mm Square, 65x65mm Square\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounted Filter Cell\u003c\/td\u003e\n\u003ctd\u003eLow Profile Filter Cell (LPFC) on 1.25\" and 2\" versions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01 (1.25\" Round Mounted, 2\" Round Mounted, 50.4mm Round Unmounted Filter)\u003cbr\u003e0.02 (50x50mm Square Filter)\u003cbr\u003e0.03 (65x65mm Square Filter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround (1.25\" Round Mounted, 2\" Round Mounted, 31mm Round Unmounted Filter, 36mm Round Unmounted Filter, 50.4mm Round Unmounted Filter)\u003cbr\u003esquare (50x50mm Square Filter, 65x65mm Square Filter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eFocusing\/dust protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm (1.25\" Round Mounted, 2\" Round Mounted, 31mm Round Unmounted Filter, 36mm Round Unmounted Filter)\u003cbr\u003e3 mm (50.4mm Round Unmounted Filter, 50x50mm Square Filter, 65x65mm Square Filter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003efull Spectrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eClearglass (31mm Round Unmounted Filter)\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Clear Focusing Filter (select size)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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\"\u003eBaader Planetarium Cleaning and Maintenance of Optics 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_Anti-Reflective_LRGBC_Filters_Product_Information.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\"\u003eBaader Planetarium Anti-Reflective LRGBC Filters Product Information\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":"1.25\" Round Mounted","offer_id":44967356039453,"sku":"BAA-2458415","price":63.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967356072221,"sku":"BAA-2458416","price":105.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted Filter","offer_id":44967356104989,"sku":"BAA-2458414","price":78.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted Filter","offer_id":44967356137757,"sku":"BAA-2459423","price":70.0,"currency_code":"CAD","in_stock":true},{"title":"50.4mm Round Unmounted Filter","offer_id":44967356170525,"sku":"BAA-2458420","price":121.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Filter","offer_id":44967356203293,"sku":"BAA-2458421","price":140.0,"currency_code":"CAD","in_stock":true},{"title":"65x65mm Square Filter","offer_id":44967356236061,"sku":"BAA-2459405","price":152.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Clear-Focusing-Filter-1__69249.1597110902.1280.1280.jpg?v=1684340987"},{"product_id":"baader-ir-pass-filter-685nm","title":"Baader IR-Pass Filter 685nm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e685nm Infrared (IR) Pass Filter\u003c\/li\u003e\n\u003cli\u003eTransmits deep-red light starting from 670nm\u003c\/li\u003e\n\u003cli\u003eDramatically reduces the image-blurring effects of atmospheric seeing\u003c\/li\u003e\n\u003cli\u003eIdeal for high-resolution planetary, lunar, and solar imaging\u003c\/li\u003e\n\u003cli\u003eServes as a superior Luminance (L) filter for LRGB composites\u003c\/li\u003e\n\u003cli\u003eFeatures reflex-free anti-reflection coatings on an optically polished substrate\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\u003eBaader IR-Pass Filter 685nm\u003c\/h2\u003e\n\u003cp\u003eThe Baader IR-Pass Filter 685nm isolates the deep-red and near-infrared spectrum, transmitting light that starts from 670nm. By blocking the shorter wavelengths of the conventional 400-700nm visual spectrum, this filter bypasses the worst of atmospheric turbulence, allowing planetary imagers to capture significantly sharper details that would otherwise be blurred by poor seeing.\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\u003eDefeating Atmospheric Turbulence with Light Beyond 685nm\u003c\/h3\u003e\n\u003cp\u003eAtmospheric seeing, the shimmering effect caused by air turbulence, is the primary obstacle to high-resolution imaging. Longer wavelengths of light are less susceptible to this distortion. The Baader 685nm IR-Pass filter exploits this physical principle by creating an image using only light from the most stable part of the spectrum, rendering dark structures on Mars, Jupiter, the Moon, and the Sun with much higher contrast and sharpness.\u003c\/p\u003e\n\u003cp\u003eBecause the filter's transmission begins at 670nm, it sits just at the edge of the visual range. This allows you to achieve focus with a sensitive camera before capturing the final, stabilized image in the near-infrared—a crucial advantage over deeper IR filters that are completely opaque to the human eye.\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\u003eLRGB Imaging: Creating a Superior Luminance Channel with the 685nm Filter\u003c\/h3\u003e\n\u003cp\u003eFor imagers using the LRGB (Luminance, Red, Green, Blue) method, the Baader 685nm IR-Pass serves as an exceptional luminance filter. On nights of unsteady seeing, capturing the 'L' channel through this filter ensures your image's foundational detail layer is as sharp as possible. This high-resolution monochrome data can then be combined with standard RGB data to produce a final color image that possesses far greater detail than one shot with a traditional broadband luminance filter.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptically Polished Substrate:\u003c\/strong\u003e Ensures the filter does not introduce any degradation to the optical path, preserving the performance of your telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Reflection Coatings:\u003c\/strong\u003e Both sides of the filter are treated with reflex-free anti-reflection coatings to maximize light transmission and prevent internal reflections from causing halos or ghosting on bright targets.\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 use the Baader 685nm IR-Pass filter instead of a regular Luminance filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA regular Luminance filter passes the entire visible spectrum (roughly 400-700nm), making it susceptible to atmospheric turbulence (seeing). The \u003cstrong\u003eBaader 685nm IR-Pass filter\u003c\/strong\u003e rejects these shorter, more easily scattered wavelengths, producing a much sharper, higher-contrast image that serves as a superior detail layer in an LRGB composite, especially on nights with poor seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I see through the Baader 685nm IR-Pass filter to focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBarely. The filter begins transmitting at 670nm, which is at the very edge of human vision in the deep red. While you won't see much detail, a bright star or planet may be visible enough to aid in focusing, especially on a sensitive monochrome camera's live view. It is significantly easier to focus with than deeper IR-pass filters (like 742nm or 850nm) which are completely opaque.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of camera works best with the Baader 685nm IR-Pass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003emonochrome CMOS or CCD camera\u003c\/strong\u003e is highly recommended. These cameras typically have much higher quantum efficiency in the near-infrared spectrum compared to one-shot color cameras, allowing for shorter exposures and better signal-to-noise ratio when using the Baader 685nm IR-Pass filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Baader 685nm IR-Pass filter improve my images of Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8\" SCT has enough aperture to resolve fine detail on Jupiter, but this is often limited by seeing. The \u003cstrong\u003eBaader 685nm IR-Pass filter\u003c\/strong\u003e will help stabilize the image, allowing you to capture sharper details in the cloud bands, the Great Red Spot, and smaller storms. By using it as your luminance channel, your final LRGB image of Jupiter will appear much more detailed than what you could capture with a standard UV\/IR cut filter alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader 685nm IR-Pass filter useful for solar imaging of sunspots?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. When used with a proper, full-aperture solar film or glass filter, the \u003cstrong\u003eBaader 685nm IR-Pass filter\u003c\/strong\u003e acts as a powerful seeing-reduction tool for white-light solar imaging. It will increase the contrast and sharpness of sunspot umbra\/penumbra details and solar granulation by minimizing atmospheric blurring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I still need RGB filters if I use the Baader 685nm IR-Pass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The image from the Baader 685nm IR-Pass filter is monochrome and only captures detail, not color. To create a full-color image, you must capture separate data using Red, Green, and Blue filters and then combine them with the high-resolution data from the IR-Pass filter in post-processing software.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eInfrared (IR) Pass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength\u003c\/td\u003e\n\u003ctd\u003e685nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-on Wavelength\u003c\/td\u003e\n\u003ctd\u003eStarts transmitting at ~670nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eHigh-Resolution Planetary, Lunar, Solar Imaging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eReflex-free anti-reflective\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eOptically Polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eContrast Enhancement, IR-Pass, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader IR-Pass Filter 685nm (Selected Size)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePlastic Filter Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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_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\"\u003eBaader Planetarium Filter Problems FAQ 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":"1.25\" Round Mounted","offer_id":44967357645085,"sku":"BAA-2458385","price":132.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967357677853,"sku":"BAA-2458386","price":209.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-IR-Pass-Filter-685nm-1__95154.1597110927.1280.1280.jpg?v=1684341019"},{"product_id":"baader-contrast-booster-filter","title":"Baader Contrast-Booster Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnhances contrast for lunar and planetary observing\u003c\/li\u003e\n\u003cli\u003eSignificantly darkens skyglow background\u003c\/li\u003e\n\u003cli\u003eReveals subtle details in Jupiter's cloud belts and Mars's polar caps\u003c\/li\u003e\n\u003cli\u003eAvailable in standard 1.25\" and 2\" mounted formats\u003c\/li\u003e\n\u003cli\u003eThreads directly into standard eyepieces and accessories\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\u003eBaader Contrast-Booster Filter\u003c\/h2\u003e\n\u003cp\u003eThe Baader Contrast-Booster Filter, available in both 1.25\" and 2\" formats, is an essential tool for cutting through skyglow to reveal sharp, high-contrast details on the Moon and planets. By selectively filtering out wavelengths associated with common streetlights while passing critical light from celestial targets, this filter makes features like Jupiter's Great Red Spot, Martian surface markings, and subtle lunar rilles distinctly more visible.\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\u003e1.25\" \u0026amp; 2\" Filters for Enhanced Lunar and Planetary Contrast\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Contrast-Booster is to increase the signal-to-noise ratio for bright objects against a brightened sky background. It aggressively blocks the yellow-orange glow from sodium and mercury-vapor streetlights, effectively darkening the space around your target. This allows the subtle colors and structures on planetary surfaces and the Moon to stand out dramatically.\u003c\/p\u003e\n\u003cp\u003eFor refractors, this filter serves a dual purpose by also cutting unfocused violet and blue light, which tightens star images and reduces chromatic aberration. The result is a cleaner, sharper view, particularly on challenging targets like the cloud bands of Jupiter and Saturn, where low-contrast details are easily lost to atmospheric scatter and optical imperfections.\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\u003eContrast-Booster vs. Standard Moon \u0026amp; Skyglow Filter: A Targeted Approach\u003c\/h3\u003e\n\u003cp\u003eWhile a generic Moon \u0026amp; Skyglow filter offers a mild reduction in light pollution with minimal color shift, the Baader Contrast-Booster is a more specialized instrument. Its transmission properties are more targeted, creating a more significant contrast enhancement at the cost of a more noticeable color cast in the image.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader Contrast-Booster:\u003c\/strong\u003e Ideal for pulling specific, faint details out of the glare on bright planets and the Moon. It excels at separating the zones and belts on Jupiter and defining the polar caps on Mars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Moon \u0026amp; Skyglow:\u003c\/strong\u003e A better choice for general-purpose, wide-field viewing where a more natural color balance is desired and the primary goal is simply to dim the sky background slightly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe trade-off is clear: for maximum detail on specific solar system targets, the Contrast-Booster's targeted filtering is superior. For casual, broad-field sweeping, a milder filter may be preferred.\u003c\/p\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\"\u003eWhat is the primary purpose of the Baader Contrast-Booster Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader Contrast-Booster is designed to increase the visual contrast of lunar and planetary details. It achieves this by filtering out specific wavelengths of light associated with skyglow from artificial lighting, which darkens the background sky and makes faint features on bright objects easier to see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader Contrast-Booster improve views of Jupiter in an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" SCT, the Baader Contrast-Booster will make Jupiter's atmospheric features significantly more distinct. It helps to separate the faint orange and brown hues of the cloud belts from the whiter zones. The Great Red Spot (GRS) becomes more clearly defined, and smaller ovals and festoons within the cloud structures are often revealed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Contrast-Booster Filter for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it can help darken the sky background, the Contrast-Booster is not a nebula filter. It is not optimized for the critical O-III and H-beta emission lines that define most nebulae. For targets like the Orion Nebula (M42) or Dumbbell Nebula (M27), a dedicated UHC or O-III filter will deliver far better results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Contrast-Booster Filter help with observing Mars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Contrast-Booster is highly effective for Mars. It helps to define the boundaries of the dark albedo features like Syrtis Major against the bright ochre deserts. It is particularly useful for making the white polar caps stand out sharply against the planet's limb.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Baader Contrast-Booster Filter introduce a strong color cast?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a noticeable color cast is a characteristic of this filter. Because it selectively removes portions of the visual spectrum, the resulting image will have a distinct bluish or greenish tint. This is a normal trade-off for the significant gain in contrast on planetary features.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this filter thread directly onto my 1.25\" and 2\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Baader Contrast-Booster filters are mounted in standard cells with standard filter threads. The \u003cstrong\u003e1.25\" version\u003c\/strong\u003e has M28.5 x 0.6 threads, and the \u003cstrong\u003e2\" version\u003c\/strong\u003e has M48 x 0.75 threads, allowing them to screw directly into the barrels of most eyepieces, diagonals, and other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eContrast Enhancement, Color Correction, IR-Cut, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003emultiple bands (see spectral image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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\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":"1.25\" Round Mounted","offer_id":44967360135453,"sku":"BAA-2458360","price":130.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967360168221,"sku":"BAA-2458365","price":209.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Contrast-Booster-Filter-1__53178.1597110973.1280.1280.jpg?v=1684341355"},{"product_id":"baader-fringe-killer-filter","title":"Baader Fringe-Killer Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces violet\/blue color fringing in achromatic refractors\u003c\/li\u003e\n\u003cli\u003eBlocks unfocused near-infrared (NIR) light for sharper digital images\u003c\/li\u003e\n\u003cli\u003eMaintains a natural, balanced color profile\u003c\/li\u003e\n\u003cli\u003eConstructed with planeoptically polished glass to preserve image sharpness\u003c\/li\u003e\n\u003cli\u003eAvailable in standard 1.25\" and 2\" mounted sizes\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\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\u003eBaader Fringe-Killer Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Baader Fringe-Killer Filter, offered in standard 1.25\" and 2\" sizes, provides a powerful correction for the chromatic aberration common to achromatic refractors. By selectively blocking both unfocused blue-violet light and infrared wavelengths, this filter delivers a significant boost in contrast for planetary and lunar observing through any 1.25\" or 2\" eyepiece.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCorrecting False Color in 1.25\" and 2\" Format\u003c\/h3\u003e\n      \u003cp\u003eAchromatic refractors, while offering excellent value, struggle to bring all colors to a single sharp focus, resulting in a distracting violet halo around bright objects. The Baader Fringe-Killer Filter targets this \"purple fringe\" by suppressing the unfocused blue-violet light, producing tighter star points and revealing subtle surface details that were previously washed out.\u003c\/p\u003e\n      \u003cp\u003eThe filter also incorporates a sharp cutoff in the near-infrared, a critical feature for digital imaging. Since CCD and CMOS sensors are sensitive to IR light that the human eye cannot see, this blocking action prevents stellar bloat and enhances overall image sharpness on planets and the Moon.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAdvanced Coatings for a Bright, Color-Balanced Image\u003c\/h3\u003e\n      \u003cp\u003eUnlike simple color filters that produce a heavy color cast, the Fringe-Killer uses dozens of modern, plasma-assisted dielectric coatings to achieve its filtering effect. This complex construction allows it to be highly selective, reducing the offensive fringe while passing other wavelengths with maximum transmission, resulting in the brightest possible view.\u003c\/p\u003e\n      \u003cp\u003eEach filter is built on a planeoptically polished substrate. This ensures that the filter itself does not introduce any optical errors, preserving the sharpness of your telescope's optics. You can even place it well ahead of the focal plane, such as in front of a binoviewer, without degrading image definition.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eBaader Fringe-Killer vs. Simple Minus-Violet Filters\u003c\/h3\u003e\n      \u003cp\u003eA basic Minus-Violet (MV) filter offers a blunt solution, aggressively cutting blue light and often leaving the image with an unnatural yellow-green tint. The Baader Fringe-Killer is a more sophisticated tool designed for discerning observers.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eColor Fidelity:\u003c\/strong\u003e The Fringe-Killer's primary advantage is its ability to maintain a much more neutral color balance. While reducing the violet fringe, it preserves the subtle blues, whites, and tans on objects like Jupiter and Saturn.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTransmission:\u003c\/strong\u003e By being more selective, the Fringe-Killer passes more light across the visible spectrum, leading to a brighter image than many MV filters. This is especially important when observing at high magnification or with smaller aperture telescopes.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eUpgrading Achromats for High-Contrast Planetary Viewing\u003c\/h3\u003e\n      \u003cp\u003eThe practical effect of the Fringe-Killer is to elevate the performance of an affordable achromat to a level approaching a far more expensive instrument. The reduction in false color significantly improves contrast, allowing you to resolve finer details on celestial bodies.\u003c\/p\u003e\n      \u003cp\u003eWith the filter in place, you can push the magnification on your achromat to see delicate cloud bands on Jupiter, the Cassini Division in Saturn's rings, and the subtle textures within lunar craters. It is an essential upgrade that unlocks the true potential of your refractor for high-resolution observing.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader Fringe-Killer differ from a standard Minus-Violet filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader Fringe-Killer uses more advanced, selective coatings than a simple Minus-Violet filter. This allows it to reduce the distracting purple fringe while maintaining a much more \u003cstrong\u003enatural color balance\u003c\/strong\u003e and delivering a \u003cstrong\u003ebrighter image\u003c\/strong\u003e. A standard MV filter often creates a strong yellow or green cast over the entire view.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Fringe-Killer make my telescope's view yellow?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. While any filter that reduces violet light will cause a very slight color shift, the Fringe-Killer is specifically designed to provide excellent color balance. The view remains remarkably neutral, preserving the subtle, natural colors of planetary surfaces and stars, unlike harsher filters which impart a strong yellow-green tint.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Fringe-Killer for astrophotography?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the Fringe-Killer is excellent for imaging with a color camera and an achromatic refractor. In addition to controlling the visible violet fringe, it also blocks near-infrared (NIR) light. This is crucial because digital sensors are sensitive to NIR, which can cause bloated stars and reduced sharpness. The Fringe-Killer provides both corrections in a single filter.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat improvement can I expect from the Baader Fringe-Killer on Jupiter with my 4\" f\/8 refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith a 4\" achromat, the Baader Fringe-Killer will provide a significant improvement on Jupiter. The purple halo around the planet will be greatly diminished, increasing contrast across the disk. This will make it easier to see the main equatorial belts, distinguish their coloration, and potentially spot finer details like festoons or ovals that were previously lost in the glare.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader Fringe-Killer useful on apochromatic (APO) refractors or reflectors?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eGenerally, no. The Fringe-Killer is designed specifically to correct the chromatic aberration inherent in \u003cstrong\u003eachromatic refractors\u003c\/strong\u003e. Apochromatic (APO) refractors and reflector telescopes (like Newtonians or SCTs) are already highly corrected for false color, so this filter would provide little to no benefit and would slightly dim the image unnecessarily.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhere should I place the Baader Fringe-Killer in my optical train for viewing the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor visual use, the Baader Fringe-Killer should be threaded directly onto the barrel of your \u003cstrong\u003e1.25\" or 2\" eyepiece\u003c\/strong\u003e. Because it is made with planeoptically polished glass, its placement is not critical, and it will not degrade image sharpness. When viewing the bright lunar limb, it will eliminate the purple fringe, making the view much more comfortable and revealing fine details right up to the edge.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" and 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eChromatic Aberration Reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMulti-layer Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003ePlaneoptically Polished Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eColor Correction, IR-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003emultiple bands (see spectral image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eBaader Fringe-Killer Filter (in selected size)\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eProtective Filter Case\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\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_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\"\u003eBaader Planetarium Filter Problems FAQ Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\" Round Mounted","offer_id":44967362101533,"sku":"BAA-2458370","price":134.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967362134301,"sku":"BAA-2458375","price":194.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Fringe-Killer-Filter-1__75286.1597110982.1280.1280.jpg?v=1684341115"},{"product_id":"baader-semi-apo-filter","title":"Baader Semi-APO Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces chromatic aberration in achromatic refractors\u003c\/li\u003e\n\u003cli\u003eEnhances contrast on the Moon, planets, and bright stars\u003c\/li\u003e\n\u003cli\u003eImproves star sharpness by tightening blue\/violet focus\u003c\/li\u003e\n\u003cli\u003eMaintains a more natural color balance than stronger \"minus-violet\" filters\u003c\/li\u003e\n\u003cli\u003eAvailable in standard 1.25\" and 2\" mounted sizes\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\u003eBaader Semi-APO Filter\u003c\/h2\u003e\n\u003cp\u003eThe Baader Semi-APO Filter is an optical upgrade for any standard achromatic refractor, available in both 1.25\" and 2\" formats. By selectively filtering unfocused violet and blue light, this filter effectively eliminates the distracting purple halos (chromatic aberration) that plague achromatic designs, delivering views with significantly improved sharpness and contrast—approaching the color fidelity of a much more expensive apochromatic (APO) telescope.\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\u003eUpgrading Achromat Optics: Reducing Chromatic Aberration\u003c\/h3\u003e\n\u003cp\u003eAchromatic refractors, while offering excellent value, struggle to bring all colors of light to the same focal point. The Baader Semi-APO filter corrects this fundamental limitation by gently attenuating the violet and blue wavelengths that cause the most prominent color fringing. This creates a cleaner, more focused image without the strong color cast introduced by more aggressive \"minus-violet\" filters, preserving a more natural view.\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\u003eThe Visual Result: Tighter Stars and Sharper Planetary Detail\u003c\/h3\u003e\n\u003cp\u003eWith the purple halo removed, the improvement in image definition is immediately obvious. Bright stars like Vega or Sirius resolve into tight, crisp points instead of bloated disks, and the blackness of space appears darker right up to the star's edge. On the Moon and planets, this translates to higher contrast; you can more easily discern fine crater details along the lunar terminator and subtle cloud bands on Jupiter that were previously washed out by the violet glow.\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\u003eBaader Semi-APO vs. Minus-Violet Filters: A More Natural Color Balance\u003c\/h3\u003e\n\u003cp\u003eWhile a standard minus-violet filter can also reduce color fringing, it often does so at the cost of imparting a strong yellow or greenish tint to the image. The Baader Semi-APO filter uses a more sophisticated coating design that produces a far more neutral color balance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinus-Violet Filter Trade-off:\u003c\/strong\u003e Stronger violet suppression often leads to an unnatural, yellow-tinted view, which can be distracting on objects like the Moon or Jupiter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader Semi-APO Advantage:\u003c\/strong\u003e Its milder, more targeted filtering provides a significant reduction in chromatic aberration while keeping the visual field looking natural and balanced. It's a refinement filter, not just a color blocker.\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\"\u003eHow does the Baader Semi-APO Filter improve views of Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eJupiter is a bright target that shows significant purple fringing in achromatic refractors. The \u003cstrong\u003eBaader Semi-APO Filter\u003c\/strong\u003e eliminates this fringe, increasing the contrast between the planet's cloud belts and zones. This makes it easier to spot subtle details like festoons and the Great Red Spot, which are often obscured by the unfocused violet light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Semi-APO Filter make my view of the Moon sharper?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Moon's bright limb is a classic test for chromatic aberration. The \u003cstrong\u003eBaader Semi-APO Filter\u003c\/strong\u003e removes the soft violet halo along the edge, making the entire disk appear sharper and more defined. This increased contrast is especially noticeable when observing fine details like rilles and small craterlets along the terminator.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader Semi-APO Filter useful on an apochromatic (APO) or ED refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not necessary for high-end APO or ED refractors. Those telescopes are already designed to correct for chromatic aberration internally. The Semi-APO filter is specifically engineered to improve the optical shortcomings of standard two-element achromatic refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Semi-APO Filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for visual use, the \u003cstrong\u003eBaader Semi-APO Filter\u003c\/strong\u003e can be beneficial for imaging with a color camera and an achromatic refractor. It helps to reduce star bloat caused by unfocused blue and violet light, resulting in tighter stars and better overall image quality. It functions similarly to a UV\/IR cut filter but with a more targeted effect on the visible violet spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between the Baader Semi-APO and a Fringe-Killer filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader Fringe-Killer filter is a more aggressive filter that blocks a larger portion of the blue\/violet spectrum. It offers stronger correction but introduces a more noticeable yellow color cast. The \u003cstrong\u003eSemi-APO Filter\u003c\/strong\u003e is a more refined version that provides excellent correction while maintaining a much more neutral and pleasing color balance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Semi-APO filter work on my Dobsonian or SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not designed for reflector or catadioptric telescopes like Dobsonians, Newtonians, SCTs, or Maksutovs. These designs do not suffer from chromatic aberration, so the filter would provide no benefit and would only slightly dim the image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Round Mounted, 2\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eCCD, Color Correction, IR-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003emultiple bands (see spectral image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group, planeoptically polished\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\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":"1.25\" Round Mounted","offer_id":44967364624669,"sku":"BAA-2458398","price":132.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967364657437,"sku":"BAA-2458399","price":238.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Semi-APO-Filter-1__73856.1597110994.1280.1280.jpg?v=1684341176"},{"product_id":"baader-uv-ir-cut-l-filter-cmos-optimized","title":"Baader UV\/IR-CUT \/ L-Filter CMOS Optimized","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBlocks unwanted UV and IR wavelengths for sharper stars\u003c\/li\u003e\n\u003cli\u003eOptimized for modern CMOS sensors to prevent star bloat\u003c\/li\u003e\n\u003cli\u003eServes as a high-transmission Luminance (L) filter for LRGB imaging\u003c\/li\u003e\n\u003cli\u003eAdvanced anti-reflection coatings minimize halos and internal reflections\u003c\/li\u003e\n\u003cli\u003eAvailable in standard 1.25\" and 2\" mounted sizes\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\u003eBaader UV\/IR-CUT \/ L-Filter CMOS Optimized\u003c\/h2\u003e\n\u003cp\u003eThe Baader UV\/IR-CUT \/ L-Filter CMOS Optimized is engineered to solve the specific challenges of modern astrophotography sensors. By providing a sharp cutoff of infrared wavelengths that cause star bloat in highly red-sensitive CMOS chips, this filter ensures your luminance data produces tight, focused stars. It combines the function of a standard UV\/IR cut filter with coatings and transmission characteristics tailored to deliver maximum signal and contrast, serving as the ideal L-filter in any LRGB imaging setup.\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\u003eEngineered for Modern Sensors: Taming IR Bloat and Halos\u003c\/h3\u003e\n\u003cp\u003eStandard UV\/IR cut filters often have a gradual cutoff in the near-infrared, allowing unwanted IR light to reach the sensor. Because modern CMOS sensors have high sensitivity in this region, this leakage results in bloated, soft stars, obscuring fine detail. The Baader CMOS Optimized filter provides a much sharper cutoff, effectively blocking this problematic IR light to keep stars pinpoint sharp.\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 High-Transmission Window for Visible Light\u003c\/h3\u003e\n\u003cp\u003eAs a luminance filter, its primary job is to collect the maximum amount of detail-rich signal across the visible spectrum. Baader's advanced coatings ensure high transmission from blue to red, capturing faint galaxy arms and nebular structures without introducing a color cast. This unfiltered, broadband signal forms the high-resolution backbone of your final LRGB color image.\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\u003eBaader Anti-Reflection and Coating Technology\u003c\/h3\u003e\n\u003cp\u003eImaging with filters placed close to the sensor, as in many filter wheels and drawers, increases the risk of halos from internal reflections. The Baader CMOS Optimized L-Filter features carefully designed anti-reflection coatings to suppress these artifacts. This ensures that bright stars like Vega or Sirius don't produce distracting rings or ghost images, preserving the clean, dark background of your images.\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\u003eBaader CMOS L-Filter vs. Standard UV\/IR Cut Filters\u003c\/h3\u003e\n\u003cp\u003eWhile both filters block UV and IR, a standard UV\/IR cut filter is often just a protective element, while the Baader CMOS-optimized version is a precision imaging tool. The key differences lie in the steepness of the IR cutoff and the quality of the anti-reflection coatings.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard UV\/IR Cut Filter:\u003c\/strong\u003e Often has a slow, gradual IR cutoff, leading to star bloat with sensitive CMOS cameras. May lack the advanced anti-reflection coatings needed to prevent halos in modern imaging trains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader CMOS Optimized L-Filter:\u003c\/strong\u003e Features a very sharp IR cutoff specifically to keep stars tight on CMOS sensors. Incorporates superior anti-reflection coatings to eliminate halos caused by reflections between the filter and sensor cover glass.\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 do I need the Baader \"CMOS Optimized\" L-Filter for my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eModern CMOS sensors are highly sensitive to near-infrared light, which is not focused at the same point as visible light by most telescopes. A standard L-filter can leak this IR light, causing stars to appear bloated and soft. The \u003cstrong\u003eBaader CMOS Optimized L-Filter\u003c\/strong\u003e has a much sharper cutoff, blocking this IR light to produce significantly tighter, sharper stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader UV\/IR-CUT \/ L-Filter help with my refractor's chromatic aberration?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is essential for refractors, especially achromatic and apochromatic doublets. These telescopes are not designed to bring ultraviolet and infrared light to a sharp focus. By blocking these wavelengths, the \u003cstrong\u003eBaader UV\/IR-CUT \/ L-Filter\u003c\/strong\u003e prevents a soft, unfocused halo from forming around stars and improves overall image contrast, even in high-end triplet APOs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader L-Filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for imaging, it can be beneficial for visual use, particularly with refractors or reflector telescopes that have corrector lenses. By cutting out-of-focus UV and IR light, it can subtly improve the snap and contrast of the view, though the effect is much more dramatic in photography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader L-Filter improve my images of the Andromeda Galaxy (M31)?\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), the Baader L-Filter allows you to capture the maximum amount of light from the core, dust lanes, and faint outer arms. By ensuring stars remain sharp pinpoints instead of bloated orbs, it allows the fine details and faint structures of the galaxy to stand out with greater clarity and resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Baader filter parfocal with other Baader filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBaader Planetarium designs its filter sets to be parfocal, meaning you should not have to significantly refocus when switching between them. This is a critical feature for automated imaging, saving time and preventing lost frames due to focus shift between your L, R, G, B, and narrowband filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader L-Filter work in my fast f\/2 RASA or Hyperstar system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Baader's CMOS-optimized filters are designed to work well in fast optical systems without significant band-shifting. The high-quality anti-reflection coatings are also crucial in these setups, where the filter is placed very close to the sensor, making it effective at preventing internal reflections and halos around bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003e2\" Round Mounted, 1.25\" Round Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eCMOS, CCD, IR-Cut, Luminance, UV-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial Features\u003c\/td\u003e\n\u003ctd\u003eCMOS-optimized with Life-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd\u003eUV\/IR-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003e420 – 685 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eReflex-Blocker™ hard coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable for f\/ratio\u003c\/td\u003e\n\u003ctd\u003ef\/15 to f\/1.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis product is a filter only. No other accessories are included.\u003c\/p\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_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\"\u003eBaader Planetarium Filter Problems FAQ 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 Mounted","offer_id":44967365935389,"sku":"BAA-2961573","price":158.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted","offer_id":50170696204573,"sku":"BAA-2961570","price":95.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-UV-IR-CUT-L-Filter-1__54067.1597111001.1280.1280.jpg?v=1684341393"},{"product_id":"zwo-ir-850nm-pass-filter-1-25","title":"ZWO IR 850nm Pass Filter – 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003ePasses Infrared Light \u0026gt; 850nm\u003c\/li\u003e\n\u003cli\u003eDramatically Steadies Planetary Views in Poor Seeing\u003c\/li\u003e\n\u003cli\u003eEnables Daylight Planetary and Lunar Imaging\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" (31.75mm) Threaded Filter Cell\u003c\/li\u003e\n\u003cli\u003eIncludes Protective Plastic Case\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\u003eZWO 850nm IR Pass Filter - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe ZWO 850nm IR Pass Filter isolates a specific slice of the near-infrared spectrum, transmitting only wavelengths longer than 850nm. Housed in a standard 1.25\" (31.75mm) threaded cell, this filter is a specialized tool for high-resolution planetary and lunar imaging, effectively bypassing the atmospheric turbulence that blurs details in the visible spectrum.\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\u003eCut Through Bad Seeing at 850nm\u003c\/h3\u003e\n\u003cp\u003eAtmospheric turbulence, or \"seeing,\" is the primary obstacle to sharp planetary detail. Because longer wavelengths of light are less scattered by air currents, imaging at 850nm and beyond dramatically stabilizes the image. This allows you to resolve finer details in Jupiter's cloud bands, the Cassini Division in Saturn's rings, and subtle craterlets on the Moon, even when seeing conditions are poor or your target is low on the horizon.\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\u003eDaylight Planetary Imaging Beyond 850nm\u003c\/h3\u003e\n\u003cp\u003eBy aggressively blocking all visible light below 850nm, this filter renders the daytime sky nearly black to an IR-sensitive camera. This unique capability opens up the possibility of imaging bright planets like Venus and Jupiter during daylight hours. The result is a high-contrast image of the planet against a dark background, free from the glare of the blue sky.\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\u003eZWO 850nm vs. 685nm IR Pass: Which to Choose?\u003c\/h3\u003e\n\u003cp\u003eZWO offers multiple IR Pass filters, and the choice depends on your conditions and camera. The 850nm filter is the more specialized of the two most common options.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO 685nm IR Pass:\u003c\/strong\u003e This filter allows more light to reach the sensor, resulting in a brighter image and shorter exposure times. It is a great all-around choice for improving detail in average-to-poor seeing and works well with a broader range of monochrome cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO 850nm IR Pass:\u003c\/strong\u003e This filter is the ultimate seeing-killer. When conditions are exceptionally turbulent, the 850nm passband delivers the steadiest possible image. The trade-off is a significantly dimmer signal, which requires a camera with high IR sensitivity and potentially higher gain settings to achieve focus and capture data.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDesigned for IR-Sensitive Cameras in a 1.25\" Cell\u003c\/h3\u003e\n\u003cp\u003eThis filter is designed for astro-imaging with an IR-sensitive monochrome or color camera; the human eye is not sensitive to 850nm light, so it cannot be used for visual observation. Its performance is directly tied to the quantum efficiency of your camera in the near-infrared. For best results, pair the ZWO 850nm IR Pass filter with a mono camera known for strong IR response. The industry-standard 1.25\" (31.75mm) threaded cell fits any standard 1.25\" filter wheel or nosepiece.\u003c\/p\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\"\u003eHow does the ZWO 850nm filter improve imaging of Jupiter on a turbulent night?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn nights with poor seeing, the Earth's atmosphere blurs the fine details of planets like Jupiter. The ZWO 850nm filter blocks the shorter, more easily scattered visible wavelengths and only lets the steadier, longer-wavelength infrared light through. This results in a much more stable image on your sensor, allowing you to capture sharper details in the Great Red Spot and equatorial cloud bands that would otherwise be a shimmering mess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO 850nm IR Pass filter with my color astronomy camera to image the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if the camera has good near-infrared sensitivity. Beyond 850nm the red, green and blue pixels of a color sensor respond almost equally, so ZWO notes that a color camera such as the ASI224MC or ASI185MC can be used like a mono camera with this filter (keep white balance at 50). The signal is dim, so a camera with strong IR response, mono or color, gives the best results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO 850nm filter suitable for visual observation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The human eye cannot see light at a wavelength of 850nm. Looking through an eyepiece with this filter attached will result in a completely black field of view. It is a specialized tool designed exclusively for use with an infrared-sensitive astronomy camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main difference between the ZWO 850nm and a 685nm IR Pass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is how aggressively they cut off visible light.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA \u003cstrong\u003e685nm filter\u003c\/strong\u003e is a good general-purpose choice, offering a significant improvement in seeing with a relatively bright signal.\u003c\/li\u003e\n\u003cli\u003eThe \u003cstrong\u003e850nm filter\u003c\/strong\u003e provides maximum seeing stabilization for the most turbulent conditions but passes much less light, requiring a very IR-sensitive camera and longer exposures or higher gain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I want to image planets during the day with the ZWO 850nm filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eImaging during the day allows you to capture planets when they are at their highest point in the sky, where atmospheric distortion is at a minimum. The ZWO 850nm filter makes this possible by blocking the visible light that makes the sky appear blue, effectively creating a dark background for your camera and allowing bright planets like Venus or Jupiter to be imaged in high contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO 850nm filter require a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, a filter wheel is not required. The filter's 1.25\" cell is threaded to screw directly onto any standard 1.25\" camera nosepiece or accessory. However, using it in a filter wheel makes it easy to switch between the 850nm filter and other filters (like LRGB) without disassembling your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-850IR1.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eIR Pass \/ Luminance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eThreaded, Round\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePassband\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 850nm\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZWO 850nm IR Pass Filter in 1.25\" Cell\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePlastic Filter Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\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\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967439859997,"sku":"ZWO-850IR1-25","price":40.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-IR-850nm-Pass-Filter-1-25-inch-1__82864.1596910056.1280.1280.jpg?v=1684341991"},{"product_id":"zwo-uv-ir-cut-filter","title":"ZWO UV\/IR CUT Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eThreads into standard 1.25\" filter holders and nosepieces\u003c\/li\u003e\n\u003cli\u003eBlocks unwanted ultraviolet (UV) and infrared (IR) wavelengths\u003c\/li\u003e\n\u003cli\u003eFunctions as a primary Luminance (L) filter for LRGB imaging\u003c\/li\u003e\n\u003cli\u003eEssential for achieving sharp focus with color CMOS and CCD cameras\u003c\/li\u003e\n\u003cli\u003eIncludes a protective plastic storage case\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\u003eZWO 1.25\" IR Cut-Off Filter\u003c\/h2\u003e\n\u003cp\u003eThe ZWO 1.25\" IR Cut-Off Filter is an essential component for any color astrocamera, threading directly into a standard 31.75mm nosepiece or filter wheel. This single filter, backed by a 2-Year ZWO warranty, corrects for bloated stars and loss of detail by blocking the unfocused infrared light your sensor sees but your eye cannot.\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\u003eRestoring Image Sharpness at 1.25\"\u003c\/h3\u003e\n\u003cp\u003eA silicon camera sensor's sensitivity extends far beyond what the human eye can see, deep into the infrared (IR) spectrum. While your telescope's optics are designed to bring visible light to a sharp focus, they do not focus IR light at the same point. This mismatch results in a sharp visual image being overlaid with a soft, blurry IR image, causing fuzzy details and bloated stars. The ZWO 1.25\" UV\/IR Cut filter solves this by completely blocking these unwanted wavelengths, restoring the sharpness your optics are capable of delivering.\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\u003eEssential IR Protection for 31.75mm Imaging Systems\u003c\/h3\u003e\n\u003cp\u003eThis filter serves a critical dual role in any astrophotography setup. For any one-shot-color camera, it is the primary defense against IR contamination and is necessary for accurate color and sharp focus. For monochrome imagers, this filter is your Luminance (L) channel in an LRGB filter set, capturing all the detail of the visible spectrum.\u003c\/p\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\"\u003eWill the ZWO 1.25\" UV\/IR Cut filter improve my images of Jupiter with a ZWO ASI224MC camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. Planetary imaging relies on capturing the finest possible details. Since your camera is highly sensitive to IR light that your telescope doesn't focus sharply, this filter removes the resulting blur, leading to much sharper views of Jupiter's cloud bands and the Great Red Spot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the ZWO 1.25\" UV\/IR Cut filter for deep-sky imaging of the Andromeda Galaxy (M31) with my color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While the effect can be more subtle than on planets, it is still essential for high-quality deep-sky images. The filter tightens star sizes across the entire frame and improves the final sharpness of dust lanes and galactic structure by eliminating the soft, unfocused IR signal that would otherwise wash out fine detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this ZWO UV\/IR Cut filter and a Luminance filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most astrophotography applications, they are functionally the same. A \u003cstrong\u003eLuminance (L) filter's\u003c\/strong\u003e primary job is to pass the entire visible spectrum while blocking ultraviolet (UV) and infrared (IR) light. This ZWO 1.25\" UV\/IR Cut filter serves that exact purpose, making it the correct choice for the L-filter in an LRGB imaging sequence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy camera has an AR window. Do I still need the ZWO 1.25\" UV\/IR Cut filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. An \u003cstrong\u003eAnti-Reflection (AR)\u003c\/strong\u003e window is designed only to maximize light transmission and prevent internal reflections. It does \u003cstrong\u003enot\u003c\/strong\u003e block IR wavelengths. You still need a separate UV\/IR Cut filter to prevent IR bloat and achieve a sharp image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO 1.25\" UV\/IR Cut filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can, but you will not notice any difference in the view. The human eye is not sensitive to the infrared light this filter blocks. Its image-sharpening effect is only apparent when using a silicon-based camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the ZWO 1.25\" UV\/IR Cut filter to my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter is housed in a standard 1.25\" threaded cell. You can screw it directly onto the 1.25\" nosepiece of your astronomy camera or into a dedicated slot in a 1.25\" filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-IRCUT1.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Class\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR Cut \/ Luminance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShape\u003c\/td\u003e\n\u003ctd\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eThreaded Cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZWO IR-Blocking Filter in 1.25\" Cell\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePlastic Filter Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\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\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"1.25\" Round Mounted","offer_id":44967447920925,"sku":"ZWO-IRCUT1.25","price":40.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967447953693,"sku":"ZWO-IRCUT2","price":69.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-UV-IR-CUT-Filter-1-25-inch-1__13605.1596910062.1280.1280.jpg?v=1684342154"},{"product_id":"zwo-ar-protective-window","title":"ZWO AR Protective Window","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProtects camera sensor from dust and humidity\u003c\/li\u003e\n\u003cli\u003e21mm diameter for specific ZWO camera models\u003c\/li\u003e\n\u003cli\u003eHigh-transmission Anti-Reflection (AR) coatings\u003c\/li\u003e\n\u003cli\u003e1\/4λ surface flatness prevents image degradation\u003c\/li\u003e\n\u003cli\u003e1.1mm thickness ensures no change to back focus\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\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\u003eZWO D21 AR Protective Window\u003c\/h2\u003e\n\u003cp\u003eThe ZWO D21 AR Window provides essential sensor protection with an optically precise 1\/4λ surface flatness to maintain image sharpness. Its 21mm diameter and slim 1.1mm thickness ensure a perfect fit in compatible ZWO cameras, using high-transmission anti-reflection coatings to shield the sensor from dust and moisture without altering the optical path.\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\u003eTransparent Protection at 1\/4λ Flatness\u003c\/h3\u003e\n\u003cp\u003eThis window serves as a clear, protective barrier between your camera's delicate sensor and the outside environment. The 1\/4λ surface flatness specification guarantees the window's surfaces are optically flat, preventing it from introducing any distortion, astigmatism, or other aberrations into your images. It is an insurance policy for your sensor that has no detectable impact on optical quality.\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\u003eSeamless Fit with a 21mm Diameter\u003c\/h3\u003e\n\u003cp\u003eDesigned as a direct replacement or protective addition, the 21mm diameter window fits a wide range of popular ZWO cameras, including the ASI120, ASI224, ASI290, ASI178, and ASI385 series. This precise sizing ensures it seats correctly within the camera body, providing a complete seal against contaminants.\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\u003eMinimal Optical Impact at 1.1mm Thickness\u003c\/h3\u003e\n\u003cp\u003eAt just 1.1mm thick and featuring anti-reflection (AR) coatings on both surfaces, this window is engineered to be nearly invisible to your telescope's light path. The AR coatings maximize light transmission and eliminate ghosting from bright stars. The 1.1mm thickness matches original factory windows, ensuring you maintain the correct back focus without needing additional spacers or adjustments.\u003c\/p\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\"\u003eWhat is the primary purpose of the ZWO D21 AR Window?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt acts as a protective cover for your camera's sensor. It shields the delicate sensor from dust, humidity, and potential physical contact without degrading image quality, thanks to its 1\/4λ flatness and AR coatings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich ZWO cameras use the D21 AR Window?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe D21 AR window is compatible with several ZWO cameras, including the \u003cstrong\u003eASI120MM\/MM-S, ASI224MC, ASI385MC, ASI290MC\/MM, ASI290MINI, ASI178MM, and ASI120MINI\u003c\/strong\u003e models. Always confirm your specific camera model before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill installing the D21 AR Window change my focus point?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. With a thickness of just 1.1mm, it is designed to be optically neutral and match the original window in compatible cameras. Your focus point and back focus should remain unchanged.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the ZWO D21 AR Window on my ASI290MM Mini?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation involves carefully unscrewing the front nosepiece of the camera to access the sensor chamber. The old window (if present) can be gently removed, and the new D21 AR window is dropped into its place. Ensure the environment is as dust-free as possible during the process.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the D21 AR Window instead of a UV\/IR cut filter for planetary imaging with my ASI224MC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is not a filter. The D21 is an AR-coated clear window designed for protection and maximum light transmission. For planetary imaging with a color camera like the ASI224MC, you still need a separate \u003cstrong\u003eUV\/IR Cut (Luminance) filter\u003c\/strong\u003e to ensure correct color balance and sharpness, as the sensor is sensitive to out-of-band light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow should I clean the ZWO D21 AR Window?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTreat it like any high-quality optic. First, use a clean air blower to remove any loose dust. For fingerprints or smudges, use a microfiber cloth with a small amount of a dedicated optical cleaning solution. Wipe gently in a circular motion from the center outwards to avoid scratching the AR coatings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-D21AR1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e21 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Flatness\u003c\/td\u003e\n\u003ctd\u003e1\/4 λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eAR Coated Protective Window\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eD21 AR Window\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"21mm","offer_id":44967448609053,"sku":"ZWO-D21AR","price":26.0,"currency_code":"CAD","in_stock":true},{"title":"25mm","offer_id":44967448641821,"sku":"ZWO-D25AR","price":26.0,"currency_code":"CAD","in_stock":true},{"title":"60mm","offer_id":44967448674589,"sku":"ZWO-D60AR","price":69.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-Protective-Window-1__97293.1596910060.1280.1280.jpg?v=1684342186"},{"product_id":"zwo-ir-cut-protective-window","title":"ZWO IR-Cut Protective Window","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e21 mm diameter protective window for select ZWO cameras\u003c\/li\u003e\n\u003cli\u003eIntegrated UV\/IR-Cut filter maintains natural color balance\u003c\/li\u003e\n\u003cli\u003e1\/4 λ surface flatness preserves image sharpness\u003c\/li\u003e\n\u003cli\u003e1.1 mm thickness for correct optical path length\u003c\/li\u003e\n\u003cli\u003eSeals sensor chamber from dust and humidity\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\u003eZWO D21 IR-Cut Window\u003c\/h2\u003e\n\u003cp\u003eThe ZWO D21 IR-Cut Window is a precision-polished optical element designed to protect your camera's sensor, featuring a 21 mm diameter and a standard 1.1 mm thickness. Its integrated UV\/IR-Cut filter preserves true color balance, while the 1\/4 λ surface flatness ensures that the window does not introduce any degradation to your final image sharpness.\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\u003ePrecision Optics: 1\/4 λ Flatness at 1.1 mm Thickness\u003c\/h3\u003e\n\u003cp\u003eThis is not simply a piece of glass; it is a critical optical component. The ZWO D21 window is ground and polished to a 1\/4 λ surface flatness, a specification that guarantees it is optically transparent and will not distort the incoming wavefront from your telescope. This preserves the finest details on planetary surfaces and ensures tight, point-like stars. The 1.1 mm thickness is standard for ZWO cameras, ensuring no change in back focus when replacing a stock window.\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\u003eOEM Protection: 21 mm Diameter with UV\/IR-Cut\u003c\/h3\u003e\n\u003cp\u003eDesigned as a direct factory replacement, the 21 mm diameter window perfectly seals the sensor chamber of compatible ZWO cameras from dust, pollen, and humidity. The integrated UV\/IR-Cut coating is essential for all color cameras, as it blocks the out-of-focus infrared and ultraviolet wavelengths that CMOS sensors are highly sensitive to. This prevents star bloat and delivers a clean, color-accurate image without requiring a separate filter.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Fit:\u003c\/strong\u003e Replaces the original window on the ASI120MC-S and ASI178MC cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEssential Filtration:\u003c\/strong\u003e Acts as the built-in IR-cut filter for color cameras, correcting for the sensor's infrared sensitivity to produce natural colors on targets like Jupiter's Great Red Spot and Mars' polar caps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Safety:\u003c\/strong\u003e Provides a physical barrier that protects the delicate CMOS sensor and its microlenses from physical contact and environmental contaminants.\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\"\u003eWhich ZWO cameras are compatible with the D21 IR-Cut Window?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO D21 IR-Cut Window is a direct replacement for the stock window on the following camera series: \u003cstrong\u003eASI120MC-S and ASI178MC.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is 1\/4 λ flatness important for the ZWO D21 window?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003e1\/4 λ (quarter-wave) flatness\u003c\/strong\u003e specification ensures the window is optically perfect and will not bend or distort light as it passes through to the sensor. A less flat window would act like a poor-quality lens, softening the image and reducing the fine detail your telescope resolves. This precision is critical for high-resolution planetary, lunar, and solar imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO D21 IR-Cut Window required for monochrome cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. ZWO lists the D21 IR-Cut Window only for the color ASI120MC-S and ASI178MC. Monochrome cameras like the ASI290MM or ASI178MM use the D21 AR window, which protects the sensor from dust and humidity without blocking IR.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I see dust spots on my ASI224MC images, do I need to replace this window?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot necessarily. The first step is to try cleaning the exterior surface of the window with a sensor cleaning kit or rocket blower. If the dust motes remain fixed in the same position on your flat frames after cleaning, they are likely on the sensor itself, which may require removing the window for a deeper cleaning. You would only replace the window if it is scratched, cracked, or the coatings are degraded.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill using the ZWO D21 IR-Cut Window affect my focus when imaging the Moon with my ASI2600MC Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it will not affect your focus. The ZWO D21 is designed to be parfocal with the original window installed in the camera from the factory. At 1.1 mm thick, it maintains the correct optical path length, so you can replace a damaged window without needing to change your focuser position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know if my ZWO camera's protective window is damaged?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDamage can be physical or a degradation of the coatings. Look for obvious scratches or cracks. Coating failure can appear as blotchy or hazy patterns on the glass that cannot be cleaned off. These issues will show up in your images as fixed artifacts or a general loss of contrast that cannot be corrected with flat frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-D21IR-CUT1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e21 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR-Cut Protective Window\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Flatness\u003c\/td\u003e\n\u003ctd\u003e1\/4 λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eD21 IR-Cut Window\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\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\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"21mm","offer_id":44967449723165,"sku":"ZWO-D21IR-CUT1","price":26.0,"currency_code":"CAD","in_stock":true},{"title":"25mm","offer_id":44967449755933,"sku":"ZWO-D25IR-CUT1","price":26.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-Protective-Window-1__97293.1596910060.1280.1280__39733.1596912514.1280.1280.jpg?v=1684342198"},{"product_id":"optolong-uv-ir-cut-filter","title":"Optolong UV\/IR Cut Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBlocks Ultraviolet (UV) and Infrared (IR) wavelengths\u003c\/li\u003e\n\u003cli\u003eImproves image sharpness and reduces star bloat\u003c\/li\u003e\n\u003cli\u003eFunctions as a luminance (L) filter for monochrome cameras\u003c\/li\u003e\n\u003cli\u003eFeatures durable, scratch-resistant ion-assisted multi-coatings\u003c\/li\u003e\n\u003cli\u003eActs as a high-transmission dust shield for your camera sensor\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" mounted sizes\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\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\u003eOptolong UV\/IR Cut Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Optolong UV\/IR Cut Filter is an essential tool for digital astrophotography, designed to restore image sharpness by blocking the invisible ultraviolet and infrared light that causes bloated stars and soft details. Because most telescope optics are corrected only for the visible spectrum, they bring UV and IR light to a different focal point, degrading contrast. This filter isolates the visible spectrum, ensuring your color or monochrome camera sensor captures a clean, sharp image from edge to edge.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eRestore Sharpness by Blocking Invisible Wavelengths\u003c\/h3\u003e\n      \u003cp\u003eUnfiltered CCD and CMOS sensors are highly sensitive to wavelengths outside human vision. This out-of-band signal reduces image quality, especially in refractive optics or camera lenses not designed for astronomical use. The Optolong UV\/IR Cut filter acts as a gatekeeper, transmitting the visible spectrum while rejecting the unfocused UV and IR light, resulting in tighter stars, higher contrast, and noticeably sharper details on planetary surfaces and in deep-sky objects.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eIon-Assisted Coatings for Consistent Results\u003c\/h3\u003e\n      \u003cp\u003eOptolong utilizes an advanced ion-assisted deposition process to create the multi-layer coatings on the UV\/IR Cut filter. This technology ensures the filter is highly resistant to scratching and easy to clean. The coatings are applied using a planetary rotation system, guaranteeing uniformity across the entire surface for consistent performance and a stable central wavelength that is unaffected by temperature changes during your imaging session.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA Vital Luminance Filter and Sensor Dust Shield\u003c\/h3\u003e\n      \u003cp\u003eFor monochrome imagers, the UV\/IR Cut filter is the ideal luminance (L) filter for LRGB imaging, capturing fine detail with maximum visible-light transmission. For both color and mono cameras, it serves another critical function: acting as a high-quality dust shield. Placed in a filter wheel or drawer, it protects your sensor from dust settling during long exposures without altering color balance, keeping your optical train clean and your flat frames pristine.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e This filter is NOT designed for solar observation. Do NOT look at or image the Sun with this filter. Permanent and irreversible eye damage will result. You will be blinded if you fail to observe this warning.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary purpose of the Optolong UV\/IR Cut filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts main purpose is to \u003cstrong\u003eblock ultraviolet (UV) and infrared (IR) light\u003c\/strong\u003e while transmitting visible light. Most telescopes focus visible light sharply, but UV and IR light focus at a different point, which can cause bloated stars and reduced image sharpness. This filter corrects that issue for any camera with a sensor sensitive to these wavelengths.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the Optolong UV\/IR Cut filter for my modified DSLR or a dedicated astronomy camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eYes, absolutely.\u003c\/strong\u003e Modified DSLRs and nearly all dedicated color and monochrome astronomy cameras have their stock UV\/IR blocking filters removed to increase sensitivity, especially to Hydrogen-alpha light. Without a replacement UV\/IR Cut filter like this one, your images will suffer from star bloat and poor focus, especially when used with refractor telescopes or camera lenses.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong UV\/IR Cut filter improve my views of Jupiter through an 8\" SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor imaging, yes. When using a color or monochrome camera to capture video of Jupiter, the Optolong UV\/IR Cut filter will produce a \u003cstrong\u003esharper, higher-contrast image\u003c\/strong\u003e by eliminating the \"smear\" from unfocused IR light. For visual observation, its effect is typically not noticeable as the human eye is not sensitive to these wavelengths.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the Optolong UV\/IR Cut filter as a luminance filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhen shooting with a monochrome camera and a filter wheel, the UV\/IR Cut filter serves as your \u003cstrong\u003eLuminance (\"L\") filter\u003c\/strong\u003e. You take long-exposure images through this filter to capture all the structural detail and brightness information in the visible spectrum. You then combine this sharp L-channel data with separate exposures taken through Red, Green, and Blue filters to create a final, full-color LRGB image.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this filter help reduce light pollution when imaging the Orion Nebula (M42)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e The Optolong UV\/IR Cut filter is not a light pollution filter. It is designed to pass the entire visible spectrum, including wavelengths from common sources of light pollution like streetlights. To combat light pollution, you would need a dedicated broadband filter (like a UHC) or a narrowband filter.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong UV\/IR Cut filter for observing the Sun?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eABSOLUTELY NOT.\u003c\/strong\u003e This filter provides no protection from the intense visible light and energy of the Sun. Attempting to view the Sun with this filter will cause immediate, catastrophic, and permanent blindness. Solar observation requires specialized solar filters designed for that express purpose that cover the front aperture of your telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCoating Technology\u003c\/td\u003e\n\u003ctd\u003eIon-assisted deposition multi-coating\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eLuminance (L) filter, UV\/IR blocking\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRecommended Cameras\u003c\/td\u003e\n\u003ctd\u003eMonochrome CCD\/CMOS, Color CCD\/CMOS, Modified DSLRs\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":44968071528733,"sku":"OPT-10601","price":62.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":44968071561501,"sku":"OPT-10602","price":91.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":52942348583197,"sku":"OPT-10604","price":77.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-UV-IR-Cut-2__28842.1673896686.1280.1280.jpg?v=1684348673"},{"product_id":"antlia-ir-pass-685nm-filter-1-25","title":"Antlia IR Pass 685nm Filter - 1.25\"","description":"\u003c!-- more --\u003e\n\u003cp\u003eThe Antlia IR Pass 685nm filter is an absorptive filter that allows infrared light with wavelengths of more than 685nm to pass through. At these longer wavelengths, the sensitivity of the unaided eye is reduced, so it is not suitable for visual observations. The filter is highly recommended for any planetary photography. At long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. The closer to the infrared band, planetary images are less disturbed by wavefront distortions in the atmosphere (seeing), result in the sharpest and highest contrast image possible.\u003c\/p\u003e\n\u003cp\u003eBy combining a luminance image taken with the IR-Pass filter, along with RGB and U-Venus filters, overall image\u003c\/p\u003e\n\u003cp\u003esharpness is significantly enhanced and details of planets in different bands are taken.\u003c\/p\u003e\n\u003cp\u003eThe filter is also possible to image the other planets during daylight due to the dark background sky created by the 685nm IR Pass Filter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e1.25” mounted, (2mm+\/-0.05mm)\u003c\/p\u003e\n\u003cp\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/p\u003e\n\u003cp\u003e30 arcsec parallelism\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1.25”( 28.5*0.6 )\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSolar Observing and imaging\u003c\/p\u003e\n\u003cp\u003eVisual observation\u003c\/p\u003e\n\u003cp\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003c\/p\u003e\n\u003cp\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45077998862621,"sku":"ANT-IR685","price":55.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-IR-Pass-685nm-Filter.jpg?v=1685814630"},{"product_id":"antlia-ir-pass-850nm-filter-1-25","title":"Antlia IR Pass 850nm Filter - 1.25\"","description":"\u003c!-- more --\u003e\n\u003cp\u003eThe Antlia IR Pass 850nm filter is an absorptive filter that allows infrared light with wavelengths of more than 850nm to pass through. It is a supplement filter of IR Pass 685nm. At these longer wavelengths, the sensitivity of the unaided eye is reduced, so it is not suitable for visual observations. The filter is highly recommended for any planetary photography. At long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. The closer to the infrared band, planetary images are less disturbed by wavefront distortions in the atmosphere (seeing), result in the sharpest and highest contrast image possible.  \u003c\/p\u003e\n\u003cp\u003eBy combining a luminance image taken with the IR-Pass filter, along with RGB and U-Venus filters, overall image sharpness is significantly enhanced and details of planets in different bands are taken. The filter is also possible to image the other planets during daylight due to the dark background sky created by the 850nm IR Pass Filter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e1.25” mounted, (2mm+\/-0.05mm)\u003c\/p\u003e\n\u003cp\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/p\u003e\n\u003cp\u003e30 arcsec parallelism\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1.25”( 28.5*0.6 )\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSolar Observing and imaging\u003c\/p\u003e\n\u003cp\u003eVisual observation\u003c\/p\u003e\n\u003cp\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003c\/p\u003e\n\u003cp\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45078000140573,"sku":"ANT-IR850","price":55.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-IR-Pass-850nm-Filter.jpg?v=1685814767"},{"product_id":"optolong-ir-pass-685nm-planetary-filter","title":"Optolong IR Pass 685nm Planetary Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003ePasses infrared light above 685nm\u003c\/li\u003e\n\u003cli\u003eAchieves greater than 90% peak transmission\u003c\/li\u003e\n\u003cli\u003eBlocks wavelengths from 350-1050nm outside the passband\u003c\/li\u003e\n\u003cli\u003e1.85mm thick B270 substrate\u003c\/li\u003e\n\u003cli\u003eSurface quality of 60\/40 with λ\/4 transmitted wavefront\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\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\u003eOptolong IR Pass 685nm Planetary Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong IR Pass 685nm Planetary Filter isolates the near-infrared region of the spectrum, transmitting wavelengths longer than 685nm with over 90% efficiency. Built on a 1.85mm B270 substrate, this filter leverages the fact that atmospheric turbulence has less effect on longer wavelengths of light, allowing your camera's sensor to capture a significantly steadier image. The filter maintains a λ\/4 transmitted wavefront and a 60\/40 surface quality, ensuring it reveals fine planetary detail without degrading your telescope's native optical resolution.\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\u003eStabilizing Planetary Views with a 685nm IR Cut-On\u003c\/h3\u003e\n\u003cp\u003eAtmospheric seeing, the blurring caused by air currents, is the primary obstacle to high-resolution planetary imaging. The Optolong IR Pass 685nm filter acts as a powerful tool to mitigate this effect by blocking visible light and passing only near-infrared light, which is less susceptible to atmospheric distortion. This results in a much sharper, higher-contrast monochrome image that can serve as a powerful luminance layer (an \"IR-LRGB\" composite) for your final color image.\u003c\/p\u003e\n\u003cp\u003eWhen imaging planets like Jupiter, Saturn, or Mars, using the 685nm IR Pass as your luminance channel captures fine details in cloud bands and surface features that are often lost in the turbulence of a standard LRGB sequence. Your CMOS or CCD sensor, sensitive to light from 350-1050nm, can take full advantage of this stable IR signal to produce results that cut through poor seeing.\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\u003eλ\/4 Wavefront and \u0026gt;90% Transmission Coatings\u003c\/h3\u003e\n\u003cp\u003eOptolong constructs the IR Pass 685nm filter with exacting optical standards to preserve the integrity of your image. A transmitted wavefront of λ\/4 and parallelism of 30 arcseconds guarantee that the filter will not introduce aberrations or distortions into your optical train. The advanced multi-layer coatings, applied using an ion-assisted deposition process, achieve greater than 90% transmission in the target passband while delivering deep \u0026gt;99% blocking of light pollution lines and other unwanted wavelengths.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate and Thickness:\u003c\/strong\u003e The 1.85mm B270 glass substrate ensures parfocality with other filters of similar thickness, minimizing the need to refocus when switching filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Coatings:\u003c\/strong\u003e The ion-assisted coating process produces a hard, scratch-resistant surface that is stable and will not degrade over time or with changes in temperature.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface Quality:\u003c\/strong\u003e A 60\/40 surface quality specification meets military standards, ensuring a clean and defect-free optical surface for maximum image contrast.\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\"\u003eWhat is the main advantage of the Optolong IR Pass 685nm filter for planets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary advantage is \u003cstrong\u003ereducing the effect of atmospheric turbulence (seeing)\u003c\/strong\u003e. Longer wavelengths of light, like the infrared light passed by this filter, are less distorted by the atmosphere. This allows you to capture a much sharper, steadier image of planets, which can be used as a high-detail luminance layer to dramatically improve your final color planetary photos.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Optolong IR Pass 685nm filter improve my images of Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn a typical night of average seeing, an 8\" SCT can resolve significant detail on Jupiter, but this detail is often blurred by the atmosphere. The Optolong IR Pass 685nm filter will produce a monochrome image that is noticeably sharper than what you'd get with a standard luminance filter. Details within the Great Red Spot, smaller storms, and fine structures in the main equatorial belts will be more defined, providing a superior foundation for your final IR-LRGB image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong IR Pass 685nm filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is an imaging-only filter. It blocks all visible light below 670nm, a region where the human eye is most sensitive. Looking through an eyepiece with this filter in place will result in a completely black field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Optolong IR Pass 685nm filter a good choice for imaging Mars with my C11?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA C11 has tremendous resolving power, but that power is often limited by atmospheric seeing. The Optolong IR Pass 685nm filter is an excellent choice for Mars because it helps stabilize the image and increases contrast between the dark albedo features (like Syrtis Major) and the lighter desert regions. It's particularly effective at cutting through thin Martian atmospheric haze and dust, revealing surface details more clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this filter work with a color camera versus a mono camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eWith a mono camera\u003c\/strong\u003e, you use the Optolong IR Pass 685nm filter to capture a high-resolution luminance (L) channel, then combine it with separate Red, Green, and Blue channels for a full-color IR-LRGB image. \u003cstrong\u003eWith a color camera\u003c\/strong\u003e, you can use the filter to capture a monochrome video stream. You can then debayer this video as monochrome to create a sharp luminance layer and combine it with a separate, unfiltered color recording from the same session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the λ\/4 wavefront and 60\/40 surface quality specs mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThese specifications refer to the optical precision of the filter. \u003cstrong\u003eλ\/4 (1\/4 wave) transmitted wavefront\u003c\/strong\u003e means the filter is extremely flat and will not distort the light passing through it, preserving the sharpness delivered by your telescope. \u003cstrong\u003e60\/40 surface quality\u003c\/strong\u003e is a standard that limits the number and size of scratches and digs on the filter's surface, ensuring a clean, high-contrast image free of artifacts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Transmission\u003c\/td\u003e\n\u003ctd\u003eT\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e350-1050nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;99% (Light Pollution Lines)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOptolong IR Pass 685nm Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":50341809914141,"sku":"OPT-12101","price":110.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":50341809946909,"sku":"OPT-12102","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-IR-Pass-685nm-Filter-2-inch.jpg?v=1757559032"},{"product_id":"player-one-uv-ir-cut-s-series-filter","title":"Player One UV\/IR-Cut S-Series Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects Color Balance for Color Cameras\u003c\/li\u003e\n\u003cli\u003eBlocks Unwanted Ultraviolet (UV) and Infrared (IR) Light\u003c\/li\u003e\n\u003cli\u003eEnhances Contrast for Lunar and Solar Imaging\u003c\/li\u003e\n\u003cli\u003eHigh-Quality S-Series Optical Glass Substrate\u003c\/li\u003e\n\u003cli\u003eDurable Multi-Layer Composite Coatings\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Filter Threading\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\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\u003ePlayer One UV\/IR-Cut S-Series Filter - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Player One UV\/IR-Cut S-Series Filter is an essential tool for achieving accurate color and maximum sharpness in planetary, lunar, and solar astrophotography, designed to fit any standard 1.25\" eyepiece or accessory.\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\u003eRestoring True Color Balance with the 1.25\" S-Series Filter\u003c\/h3\u003e\n\u003cp\u003eModern color astronomy cameras, like the Player One Mars-C, have sensors that are highly sensitive to light beyond the visible spectrum. This sensitivity to ultraviolet (UV) and infrared (IR) light can cause color shifts, often resulting in a purple or magenta cast in your images and bloated, unfocused stars. The Player One UV\/IR-Cut filter solves this by selectively blocking these wavelengths, ensuring that only visible light reaches the sensor for images with natural, true-to-life color balance.\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 Critical Filter for High-Contrast Solar and Lunar Imaging\u003c\/h3\u003e\n\u003cp\u003eBeyond color correction, blocking unfocused IR radiation is critical for image sharpness. Strong infrared light, especially prevalent during solar and lunar imaging, can reduce image clarity and soften fine details. By adding this UV\/IR-Cut filter to your imaging train, you eliminate this source of low-contrast haze. This results in visibly sharper views of lunar crater rims, rilles, and the subtle details within solar sunspots and granulation (when used with a dedicated, safe solar filter).\u003c\/p\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 do I need the Player One UV\/IR-Cut filter for my color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYour color camera's sensor can \"see\" ultraviolet and infrared light that your eyes cannot. This out-of-band light focuses at a different point than visible light, causing color fringing, bloated stars, and a loss of detail. The \u003cstrong\u003ePlayer One UV\/IR-Cut filter\u003c\/strong\u003e blocks this unwanted light, resulting in correct color balance and sharper images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Player One 1.25\" UV\/IR-Cut filter improve my images of Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. Planets like Jupiter and Saturn have distinct color zones that are washed out by infrared light. Using the \u003cstrong\u003ePlayer One UV\/IR-Cut filter\u003c\/strong\u003e will help render the Great Red Spot, cloud bands, and Cassini Division with more accurate color and higher contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Player One UV\/IR-Cut S-Series filter for solar imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is highly recommended for solar imaging, but it is \u003cstrong\u003eNOT\u003c\/strong\u003e a standalone solar filter. You must use it in combination with a primary, professional-grade solar filter that covers the front of your telescope. The UV\/IR-Cut filter then serves as a secondary filter to further increase contrast by blocking excess IR that passes through the main filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Player One filter necessary if I use a refractor telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While apochromatic (APO) refractors are well-corrected for visible light, most are not designed to bring UV and IR light to the same focal plane. A UV\/IR-cut filter is therefore essential for any telescope type—refractor, reflector, or SCT—when imaging with a color camera that does not have a built-in IR-cut window.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Player One UV\/IR-Cut filter work in a 1.25\" filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003ePlayer One UV\/IR-Cut S-Series filter\u003c\/strong\u003e is housed in a standard 1.25\" cell with male M28.5x0.6 threads, making it compatible with any standard 1.25\" filter wheel, filter drawer, or accessory that accepts threaded filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between this Player One UV\/IR-Cut filter and a Luminance filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBoth filters block UV and IR light. However, a Luminance (L) filter is specifically designed for monochrome imaging, with a precise bandpass engineered to match the focal point of a set of RGB filters. A standard UV\/IR-Cut filter, like this one from Player One, is designed for broadband color correction with a one-shot-color (OSC) camera and may have a slightly wider transmission window.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\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)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eS-Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePlayer One UV\/IR-Cut S-Series Filter - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":51112144175389,"sku":"POA-UV-IR-CUT-125","price":31.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Player-One-UV-IR-CUT-1_25inch-Filter.jpg?v=1775160317"},{"product_id":"player-one-uv-ir-cut-anti-halo-filter-2","title":"Player One UV\/IR-Cut Anti-Halo Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBlocks unwanted Ultraviolet (UV) and Infrared (IR) wavelengths\u003c\/li\u003e\n\u003cli\u003eFeatures advanced anti-halo coatings to minimize reflections\u003c\/li\u003e\n\u003cli\u003eStandard 2\" filter cell with M48x0.75 threads\u003c\/li\u003e\n\u003cli\u003eMaximizes contrast and sharpens stars in color and monochrome imaging\u003c\/li\u003e\n\u003cli\u003eEssential for refractive and catadioptric telescopes\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\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\u003ePlayer One UV\/IR-Cut Anti-Halo Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Player One UV\/IR-Cut Anti-Halo Filter provides critical ultraviolet and infrared blocking in a standard 2\" threaded cell, using advanced coatings to eliminate halos around bright stars for cleaner, higher-contrast astronomical images.\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 2\" Filter for Sharper Stars and Higher Contrast\u003c\/h3\u003e\n\u003cp\u003eWhile your camera sensor is sensitive to a wide spectrum of light, most telescopes are only designed to bring visible light to a sharp focus. Out-of-focus UV and IR light creates a soft, low-contrast halo around stars, commonly known as \"star bloat,\" which degrades image sharpness. This 2\" filter blocks those unwanted wavelengths, ensuring only focused, visible light reaches the sensor.\u003c\/p\u003e\n\u003cp\u003eThe result is immediately apparent in your images: stars become tighter, finer details emerge in nebulae and galaxies, and the overall contrast of the image is significantly improved. It is an essential component for any imaging setup using a refractor, Schmidt-Cassegrain, or any other compound telescope design.\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\u003eSuppressing Halos and Internal Reflections\u003c\/h3\u003e\n\u003cp\u003eBeyond simple UV\/IR blocking, the Player One filter incorporates multi-layer anti-reflection coatings specifically designed to combat halos. Halos are caused by bright starlight reflecting between the filter surface and the camera sensor cover glass. This filter's coatings disrupt these internal reflections, preventing distracting rings from forming around bright targets like Vega or Alnitak.\u003c\/p\u003e\n\u003cp\u003eThis anti-halo technology is particularly crucial for modern, highly-reflective CMOS sensors. By minimizing these artifacts at the source, you spend less time processing them out and achieve a cleaner final image straight from the camera.\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\u003ePlayer One UV\/IR-Cut vs. Standard Luminance Filters\u003c\/h3\u003e\n\u003cp\u003eWhile both this filter and a standard Luminance (L) filter perform the same core function of blocking UV and IR light, the Player One Anti-Halo filter is engineered for a different challenge. Many basic L-filters can still produce noticeable halos and internal reflections when used with bright stars and sensitive modern sensors.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard L-Filter:\u003c\/strong\u003e Primarily focused on cutting UV\/IR wavelengths. It is effective for basic luminance data collection but may struggle with reflections on bright targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlayer One Anti-Halo Filter:\u003c\/strong\u003e Provides the same UV\/IR cut but adds advanced coatings optimized to suppress the internal reflections that cause halos. It is the superior choice for imagers who demand the cleanest possible raw data, especially when shooting targets in star-rich fields.\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\"\u003eWhen do I need the Player One 2\" UV\/IR-Cut filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter is essential for nearly all astronomical imaging with a color or monochrome camera, especially when using a telescope that is not a pure reflector (like a Newtonian). \u003cstrong\u003eRefractors, SCTs, Maksutovs, and RCs\u003c\/strong\u003e all benefit significantly, as they do not focus UV and IR light at the same plane as visible light, which causes bloated stars. This filter corrects that by only allowing visible light to pass.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Player One filter help reduce star bloat in my 80mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 80mm refractor, particularly an achromatic or doublet design, is a prime example of an optical system that needs strong UV\/IR filtering. Without it, unfocused infrared light will create soft, bloated halos around your stars. The Player One UV\/IR-Cut filter will produce noticeably tighter, sharper stars across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Player One UV\/IR-Cut filter necessary for imaging Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is highly recommended for planetary imaging. Using this filter with a color camera when imaging Jupiter or Saturn ensures that only the focused visible light contributes to the final image. This increases sharpness and contrast, allowing you to resolve finer details in the cloud bands and the Great Red Spot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this Player One filter and a standard L-filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBoth filters block UV and IR light. However, the Player One UV\/IR-Cut Anti-Halo filter includes superior multi-layer coatings designed to eliminate internal reflections between the filter and the camera sensor. This specifically targets and reduces the \"halos\" that can appear around very bright stars, a common issue with standard L-filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Player One 2\" Anti-Halo filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is designed for imaging, it can be used visually. Some observers with highly-corrected apochromatic refractors find it can slightly improve contrast at the eyepiece. However, its primary and most significant benefit is for photographic and digital imaging applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach this 2\" Player One filter to my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Player One filter has standard \u003cstrong\u003eM48x0.75 female threads\u003c\/strong\u003e. It can be threaded directly into a 2\" filter wheel, a filter drawer, or the 2\" nosepiece of your camera or field flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":51112145813789,"sku":"POA-AH-UV-IR-CUT-2","price":83.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Player-One-UV-IR-CUT-2inch-Filter.png?v=1775160543"},{"product_id":"svbony-uv-ir-cut-filter","title":"SVBONY UV IR-Cut Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBlocks unwanted Ultraviolet (UV) and Infrared (IR) wavelengths\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch filter threads for wide compatibility\u003c\/li\u003e\n\u003cli\u003eImproves image contrast and color fidelity in astrophotography\u003c\/li\u003e\n\u003cli\u003eReduces chromatic aberration, especially in refractor telescopes\u003c\/li\u003e\n\u003cli\u003eActs as a durable dust and debris shield for your camera sensor\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\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\u003e2-inch UV IR Cut Filter\u003c\/h2\u003e\n\u003cp\u003eThis standard 2-inch UV\/IR Cut Filter is an essential component for any astrophotographer using a color camera, modified DSLR, or CCD. By blocking invisible ultraviolet and infrared light, this 2-inch filter ensures your sensor only records the visible spectrum, resulting in sharper stars and truer colors. Designed with standard 2-inch filter threads, it installs directly onto 2-inch eyepieces, nosepieces, and filter wheels for immediate image improvement.\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\u003eSharpen Your Images: The 2-inch UV\/IR Cut Advantage\u003c\/h3\u003e\n\u003cp\u003eMany telescopes, particularly refractors, are not fully corrected for wavelengths outside the visible spectrum. When unfocused UV and IR light hits your sensor, it creates a soft halo around stars, reduces contrast, and can cause a magenta cast in your images. This 2-inch filter eliminates that problem by acting as a \"luminance\" filter for your one-shot-color camera, transmitting only visible light for tighter, higher-contrast results.\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 Critical L-Filter for 2-inch Color Imaging Setups\u003c\/h3\u003e\n\u003cp\u003eFor anyone using a modified DSLR, a dedicated astronomy CCD, or even a sensitive webcam for planetary imaging, this filter is not optional—it's necessary. Digital sensors have a native sensitivity to infrared light that the human eye lacks. This filter restores natural color balance, provides finer color gradation, and prevents the ghosting and internal reflections caused by IR radiation bouncing within the optical train.\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\u003eProtect Your Sensor with This 2-inch Optical Glass Filter\u003c\/h3\u003e\n\u003cp\u003eBeyond its optical benefits, this 2-inch UV\/IR Cut filter serves as a permanent, high-quality protector for your expensive camera sensor. Made from true optical quality glass, it shields the sensor from dust, moisture, and potential scratches without degrading image quality. It's an inexpensive insurance policy that keeps your primary imaging equipment safe while you work.\u003c\/p\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\"\u003eWhat is the main purpose of this 2-inch UV\/IR Cut Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary job is to block invisible ultraviolet (UV) and infrared (IR) light from reaching your camera sensor. This is crucial because digital sensors are sensitive to these wavelengths, which can cause bloated stars, reduced contrast, and unnatural color casts in your astrophotos. It effectively cleans up the signal for a sharper, more accurate image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need this 2-inch UV\/IR Cut filter for my modified DSLR camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes, absolutely.\u003c\/strong\u003e When a DSLR is \"astro-modified,\" the stock IR-blocking filter is removed to increase sensitivity to hydrogen-alpha light. A side effect is that the sensor becomes highly sensitive to all IR light, which will ruin color balance and sharpness. This external 2-inch filter restores the necessary IR cut, allowing you to capture nebulae while maintaining correct star colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 2-inch UV\/IR Cut Filter help when imaging with a refractor telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eRefractor telescopes, especially achromatic and some ED doublets, focus different colors of light at slightly different points. This effect, known as chromatic aberration, is often worse in the UV and IR spectrum. By blocking these wavelengths, the 2-inch filter prevents the \"blue-violet bloat\" and soft focus associated with unfocused light, leading to a much sharper final image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 2-inch filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is optically transparent in the visible spectrum, a UV\/IR cut filter typically provides no noticeable benefit for visual observing. The human eye is not sensitive to the wavelengths it blocks. Its primary application is for imaging with digital sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2-inch UV\/IR Cut Filter thread into my 2-inch eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This filter uses standard 2-inch filter threads (M48x0.75), which is the industry standard for 2-inch eyepieces, nosepieces, filter wheels, and other astronomy accessories. It should be compatible with any standard 2-inch format equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this 2-inch filter affect imaging the Orion Nebula (M42) with my color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUsing this 2-inch filter when imaging the Orion Nebula (M42) will result in a significantly better image. It will produce tighter, more defined stars in the Trapezium cluster, better contrast between the glowing gas and dark dust lanes, and more natural color rendition in the faint outer loops. Without it, the bright core can easily appear bloated and lose detail due to IR signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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\u003cp\u003eThis product is covered by a standard manufacturer's warranty.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861233398045,"sku":"SV-F9127A","price":22.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861233430813,"sku":"SV-F9127B","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-2inch-UV-IR-Cut-Filter-1_12f74808-11aa-4745-b413-c46227b1a7b9.jpg?v=1788660020"},{"product_id":"svbony-sv164-dark-filter-for-ccd-and-cmos-cameras","title":"SVBONY SV164 Dark Filter for CCD and CMOS Cameras","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch Filter Size\u003c\/li\u003e\n\u003cli\u003eStandard M48x0.75 Threads\u003c\/li\u003e\n\u003cli\u003eEnables Automated Dark Frame Capture\u003c\/li\u003e\n\u003cli\u003e1mm Filter Thickness\u003c\/li\u003e\n\u003cli\u003eDurable Anodized Aluminum Cell\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\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\u003eSVBONY SV164 Dark Filter for CCDs Camera 2 inch\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV164 Dark Filter for CCDs Camera 2 inch simplifies calibration by integrating directly into your 2-inch filter wheel or drawer with standard M48x0.75 threads. This 1mm thick filter provides a perfectly opaque surface, allowing you to automate dark frame acquisition without ever touching your telescope cap.\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\u003eAutomated Dark Frames: The 1mm Solution for 2-inch Imaging Trains\u003c\/h3\u003e\n\u003cp\u003eA dark filter is a fundamental tool for serious imagers, enabling the automated capture of dark frames—essential for removing thermal noise from your images. By placing the SV164 in a filter wheel, you can program your acquisition software to capture darks at the end of a session without manual intervention. The standard 1mm thickness helps maintain consistent focus across your filter set.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomated Workflow:\u003c\/strong\u003e Integrate the SV164 into a 2-inch filter wheel and capture dark frames as a seamless part of your imaging sequence, even from a remote observatory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfect Opacity:\u003c\/strong\u003e The filter is designed to be completely opaque, ensuring no stray light can contaminate your crucial calibration frames.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2-inch Format:\u003c\/strong\u003e M48x0.75 threads ensure compatibility with all standard 2-inch filter wheels, filter drawers, and other threaded accessories designed for larger sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe SV164 Filter vs. Manual Capping: Repeatable M48x0.75 Integration\u003c\/h3\u003e\n\u003cp\u003eWhile capping your telescope is a free alternative, it introduces variables that a dedicated dark filter eliminates. Manually placing a cap risks bumping the telescope, altering focus or pointing, and can suffer from light leaks. A remote observatory makes manual capping impossible.\u003c\/p\u003e\n\u003cp\u003eThe SVBONY SV164 filter threads securely into your imaging train with its M48x0.75 interface, creating a perfectly light-tight seal every time. This guarantees consistent, high-quality dark frames and enables you to capture them at the correct sensor temperature throughout the night, dramatically improving your final image quality by ensuring your calibration data is a perfect match for your light frames.\u003c\/p\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\"\u003eWhat is the purpose of the SVBONY SV164 Dark Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV164 is a specialized, completely opaque filter used for taking \u003cstrong\u003edark frames\u003c\/strong\u003e. These are critical calibration files that record the thermal noise generated by your camera's sensor. By subtracting this noise pattern from your light frames (your actual images), you can significantly clean up your final astrophoto.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SV164 2-inch filter improve my astrophotography workflow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy installing the SV164 in a 2-inch filter wheel or drawer, you can automate the process of taking dark frames. Instead of manually going to your telescope to put the lens cap on at the end of a session, your imaging software can simply switch to the dark filter and begin capturing calibration frames immediately, saving time and effort.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV164 filter for observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The SV164 is a dark frame filter, meaning it is completely opaque and blocks all light. It is a tool for camera calibration only and cannot be used for visual observation or for imaging celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need a 2-inch dark filter like the SV164 instead of just a 1.25-inch version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 2-inch filter is necessary if you are using a camera with a large sensor (such as APS-C or full-frame) or a 2-inch filter wheel to avoid vignetting. The larger M48x0.75 threads and filter diameter match the rest of your 2-inch imaging train, ensuring the entire sensor is covered.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy imaging sequence for the Andromeda Galaxy (M31) finishes at 3 AM. How does the SV164 filter help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the SV164 in your filter wheel, you can program your software to automatically switch to the dark filter and begin taking dark frames the moment your M31 sequence ends. This means you can be asleep while your rig correctly captures temperature-matched calibration frames, ensuring the highest quality data without any manual effort.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV164 filter compatible with my 2-inch filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SVBONY SV164 uses standard \u003cstrong\u003eM48x0.75 threads\u003c\/strong\u003e and is housed in a standard 2-inch filter cell. It is compatible with virtually all 2-inch filter wheels and filter drawers from brands like ZWO, QHY, Atik, and others.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eDark Frame Imaging Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Type\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1mm\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV164 Dark Filter - 2 inch\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861236117789,"sku":"SV-W9124A","price":16.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861236150557,"sku":"SV-W9124B","price":19.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV164-Dark-Filter-for-CCDs-Camera-2-inch-1_16373d27-3d97-46f9-a7cf-700274e2882f.jpg?v=1788660218"},{"product_id":"svbony-sv183-685nm-ir-pass-filter","title":"SVBONY SV183 685nm IR Pass Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e685nm Infrared (IR) Pass Filter\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Threaded Barrel\u003c\/li\u003e\n\u003cli\u003eTransmits \u0026gt;95% of light from 673nm to 1100nm\u003c\/li\u003e\n\u003cli\u003eBlocks Visible Light with OD2 Blocking from 400-660nm\u003c\/li\u003e\n\u003cli\u003e1\/4λ Surface Parallelism for Minimal Image Distortion\u003c\/li\u003e\n\u003cli\u003eConstructed with SCHOTT B260 Optical Glass\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\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\u003eSVBONY SV183 685nm IR Pass Filter 1.25\" for Planetary Astrophotography\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV183 685nm IR Pass Filter is a specialized tool for planetary imagers, designed to cut through atmospheric turbulence by isolating near-infrared light with a sharp 670nm cut-on. This 1.25\" filter uses SCHOTT B260 glass to achieve over 95% transmission in its passband (673-1100nm), capturing a steady signal that atmospheric seeing affects far less than visible light. The result is a sharper, more detailed monochrome image of planetary surfaces, especially during nights of average or poor seeing.\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\u003eStabilize Atmospheric Seeing with \u0026gt;95% IR Transmission\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the SV183 filter is to mitigate the effects of atmospheric turbulence, or \"seeing.\" Shorter wavelengths of light (like blue and green) are scattered more aggressively by air currents, causing the familiar shimmering effect. By blocking all light below 670nm and passing over 95% of light from 673nm to 1100nm, this filter allows you to capture only the longer, more stable infrared wavelengths, effectively \"freezing\" the image and revealing fine details on Jupiter's cloud bands or Martian surface features that would otherwise be blurred.\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\u003ePrecision Optics: 1\/4λ Parallelism in a 1.1mm Substrate\u003c\/h3\u003e\n\u003cp\u003eA filter is useless if it degrades your telescope's optical quality. The SV183 is built on a high-grade SCHOTT B260 glass substrate with a thickness of just 1.1mm to minimize focus shift. Critically, it features a surface parallelism of 1\/4λ (lambda), ensuring the filter surfaces are optically flat and parallel to prevent introducing astigmatism or other distortions into the light path, preserving the sharpness of your planetary data.\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\u003eSV183 685nm vs. Red Filters: A Dedicated Seeing-Cutter\u003c\/h3\u003e\n\u003cp\u003eWhile a standard deep-sky red filter can offer some seeing reduction, the SV183 685nm is a far more aggressive and specialized tool. A typical red filter has a wider, more gradual passband, letting in significant visible light that is still susceptible to turbulence. The SV183's sharp 670nm cut-on creates a dedicated monochrome luminance channel purely in the near-IR spectrum.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Contrast:\u003c\/strong\u003e On planets like Mars and Jupiter, imaging in the 685nm+ range enhances the contrast of surface and cloud features.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonochrome Imaging:\u003c\/strong\u003e This filter is intended for use with monochrome cameras to create a high-resolution luminance (L) layer, which can then be combined with color data (RGB) taken separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeeing Penetration:\u003c\/strong\u003e The OD2 blocking of visible light from 400-660nm ensures that only the most stable wavelengths reach your sensor, making it more effective than a generic red filter on nights with poor atmospheric stability.\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\"\u003eWhat is the main purpose of the SVBONY SV183 685nm IR Pass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary purpose is to improve planetary imaging by combating atmospheric turbulence (\"seeing\"). It blocks visible light and only passes near-infrared light (starting at 670nm), which is less affected by air currents. This results in a sharper, more stable image, allowing you to capture finer details on planets like Jupiter, Saturn, and Mars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a monochrome camera to use the SV183 685nm filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes, a monochrome camera is strongly recommended.\u003c\/strong\u003e A color camera has a Bayer matrix that blocks two-thirds of the incoming light for any given color. Since this filter passes only a narrow slice of the spectrum, using it with a color camera will result in a very dim, low-resolution red image. It is designed to be used with a mono camera to capture a high-detail luminance channel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV183 685nm filter affect my exposure times for Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou should expect significantly longer exposure times compared to imaging without a filter or with a standard UV\/IR cut filter. Because the SV183 blocks the entire visible spectrum where camera sensors are most sensitive, you will need to increase your gain, exposure time, or both to get a sufficiently bright histogram. This is a normal trade-off for the benefit of stabilized seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV183 685nm filter for deep-sky imaging of the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically possible, it is not ideal. Most of the interesting visual detail in emission nebulae like M42 comes from specific visible wavelengths like Hydrogen-alpha (656nm) and Oxygen-III (501nm). The SV183 blocks these entirely. You would only capture the faint, reflected infrared continuum, losing all the vibrant color and structure the nebula is known for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 1\/4λ parallelism spec mean for the SV183 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1\/4λ (one-quarter wavelength) parallelism\u003c\/strong\u003e is a measure of optical quality. It guarantees that the two faces of the filter glass are extremely parallel to each other. This prevents the filter from distorting the light passing through it, which could otherwise degrade image sharpness or introduce aberrations like astigmatism. It ensures the filter will not compromise the high-resolution images you are trying to capture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 685nm cutoff on the SV183 compare to using a standard red filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard red (R) filter for LRGB imaging typically starts passing light around 600nm. The SVBONY SV183 has a much sharper and deeper cutoff at 670nm. This makes it more effective at eliminating turbulent visible light. The SV183 is a specialized \"seeing cutter,\" whereas a red filter is a broadband component for color imaging that offers only a mild seeing-reduction benefit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eIR Pass Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-On Wavelength\u003c\/td\u003e\n\u003ctd\u003e670nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;95% from 673-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003eOD2 @ 400-660nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e350-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Material\u003c\/td\u003e\n\u003ctd\u003eSCHOTT B260\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Parallelism\u003c\/td\u003e\n\u003ctd\u003e1\/4 λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism (Angle)\u003c\/td\u003e\n\u003ctd\u003e30”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrame Material\u003c\/td\u003e\n\u003ctd\u003eAviation Aluminum 6061T6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eSingle Thread M28.5x0.6 (1.25\")\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSVBONY SV183 685nm IR Pass Filter 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Plastic Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861236248861,"sku":"SV-W9142A","price":26.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861236281629,"sku":"SV-W9142B","price":40.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV183-685nm-IR-Pass-Filter-1-25-for-Planetary-Astrophotography-1_2c98d5cf-6620-40ad-b04d-c336087bc7d2.jpg?v=1788660230"},{"product_id":"svbony-sv231-fringe-killer-color-correction-filter","title":"SVBONY SV231 Fringe Killer Color Correction Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces violet fringing (chromatic aberration) in achromatic refractors\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" filter threads for universal compatibility\u003c\/li\u003e\n\u003cli\u003eBlocks IR wavelengths above 700nm for sharper imaging\u003c\/li\u003e\n\u003cli\u003eImproves contrast on lunar and planetary surfaces\u003c\/li\u003e\n\u003cli\u003eUltra-lightweight at only 4.2g (0.15oz)\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\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\u003eSVBONY SV231 1.25\" Fringe Killer Color Correction Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV231 is a 1.25\" fringe-killer filter designed to correct chromatic aberration in achromat refractors, weighing only 4.2g. It selectively blocks defocused blue light and near-infrared (NIR) wavelengths above 700nm—extending its blocking range up to 1150nm—to sharpen views of the Moon and planets by removing distracting violet halos.\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\u003eTaming Achromatic Aberration: Blocking Blue and IR Above 700nm\u003c\/h3\u003e\n\u003cp\u003eAchromatic refractors, by design, struggle to bring all colors of light to the same focal point, resulting in a purple or blue \"fringe\" around bright objects like the Moon, Jupiter, and bright stars. The SV231 filter directly targets this issue by blocking defocused light in the blue spectrum and cutting off infrared light above 700nm. By removing these out-of-focus wavelengths, the filter allows the correctly focused light to reach your eye or camera sensor, dramatically tightening the image and improving sharpness.\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\u003eEnhanced Lunar \u0026amp; Planetary Contrast in a 1.25\" Filter\u003c\/h3\u003e\n\u003cp\u003eWith the violet glow eliminated, the true details on celestial surfaces become visible. The SVBONY SV231 filter boosts contrast, revealing finer crater details, rilles, and mountain ranges on the Moon. On planets, this translates to better definition in Jupiter's cloud bands and a more distinct view of Saturn's rings against the planet's disk. Its standard 1.25\" threaded body allows it to be used on virtually any eyepiece or camera nosepiece, making it an easy upgrade for any achromat owner.\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\u003eSVBONY SV231 vs. Baader Fringe-Killer: An Accessible Entry Point\u003c\/h3\u003e\n\u003cp\u003eThe SVBONY SV231 serves as a highly effective and affordable alternative to premium options like the Baader Fringe-Killer. While more expensive filters may employ more complex multi-coating formulas, the SV231 delivers a significant improvement in image quality for any achromat user struggling with chromatic aberration. For observers wanting to clean up their views without a large investment, this filter provides the core function of violet fringe reduction and makes high-contrast observing accessible.\u003c\/p\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\"\u003eWhat does the SVBONY SV231 Fringe Killer actually do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV231 is a color correction filter that blocks specific wavelengths of light that are poorly focused by achromatic refractor telescopes. Specifically, it reduces the violet\/blue light and cuts out infrared light above 700nm, which sharpens the image and increases contrast on bright objects like the Moon and planets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV231 filter change the color of the view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, like most fringe-killer filters, it will impart a slight color cast to the image, typically a very pale yellow-green. This is a normal trade-off for the significant increase in sharpness and contrast. The effect is most noticeable on bright white objects like the Moon, but it is generally considered a minor compromise for the removal of the distracting violet fringe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SVBONY SV231 improve my view of Jupiter through a 4\" f\/10 achromat?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThrough a 4\" f\/10 achromat, Jupiter often shows a soft purple halo that reduces contrast. The SVBONY SV231 will filter out this halo, resulting in a blacker sky background around the planet. This makes the boundary between the cloud bands and zones much more distinct and can help you resolve smaller features like barges and ovals within the belts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV231 useful for imaging the Moon's crater Clavius?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. When imaging a bright target like the Moon, chromatic aberration can soften the fine details within craters. Using the SVBONY SV231 will tighten the focus, allowing a CMOS or CCD camera to capture much sharper detail in the craterlets on the floor of Clavius and the definition of its terraced walls.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the SVBONY SV231 filter for my apochromatic (APO) or ED refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not necessary for high-end APO or ED refractors. Those telescopes use special glass elements to correct for chromatic aberration optically, so they do not produce the prominent violet fringing that this filter is designed to eliminate. Using it on an APO would only add a slight, unnecessary color tint.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV231 filter for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it can be used to tighten star images in star clusters, the SVBONY SV231 is not ideal for faint deep-sky objects like nebulae and galaxies. It reduces overall light transmission slightly and is designed to improve high-contrast planetary and lunar views. For deep-sky, a broadband or narrowband nebula filter is a much better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV231\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eFringe Killer \/ Color Correction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e4.2g \/ 0.15oz\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSVBONY SV231 1.25\" Fringe Killer Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Plastic Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861236936989,"sku":"SV-W9186A","price":43.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861236969757,"sku":"SV-W9186B","price":56.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV231-1-25-Fringe-Killer-Color-Correction-Filter-for-Lunar-1_8a241120-4dd9-4e21-8f45-fc9aaf7e76c1.jpg?v=1788660278"},{"product_id":"baader-planetarium-fcct-2-inch-unmounted-clearglass-filter-47-4-mm","title":"Baader Planetarium FCCT 2\" Unmounted Clearglass Filter (Ø 47.4 mm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch (47.4 mm) unmounted clearglass filter\u003c\/li\u003e\n\u003cli\u003eDesigned to be parfocal with other Baader narrowband filters\u003c\/li\u003e\n\u003cli\u003eCMOS-optimized anti-reflection coatings\u003c\/li\u003e\n\u003cli\u003eEnables fast, precise focusing before switching to dim filters\u003c\/li\u003e\n\u003cli\u003eServes as a high-transmission protective dust shield for your sensor\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\u003eBaader FCCT 2\" Unmounted Clearglass Filter (Ø 47.4 mm)\u003c\/h2\u003e\n\u003cp\u003eThe Baader FCCT 2\" Unmounted Clearglass Filter provides a 47.4 mm clear optical window designed as a critical parfocal tool for narrowband imaging. This filter is mechanically matched in thickness to other Baader narrowband filters, ensuring your focus position remains unchanged when switching from this clear filter to a dim H-alpha or OIII filter, saving critical imaging time.\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\u003eThe 2\" Parfocal Solution for Narrowband Imaging\u003c\/h3\u003e\n\u003cp\u003eFocusing through an extremely narrow bandpass filter can be a slow and frustrating process, as the dim view makes it difficult to achieve critical sharpness. This clearglass filter solves the problem by allowing you to use the full, bright light spectrum from a star to nail your focus quickly and accurately. Because it shares the same mechanical thickness as Baader's other CMOS-optimized filters, you can simply swap it out for your imaging filter without needing to refocus.\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 47.4 mm CMOS-Optimized Dust Shield\u003c\/h3\u003e\n\u003cp\u003eBeyond its focusing utility, this filter serves as a high-quality protective window for your camera sensor. The \"CMOS-optimized\" designation signifies that it features advanced anti-reflection coatings designed to suppress halos and internal reflections that can occur with highly reflective modern sensors. This ensures that it protects your sensor from dust without degrading your image quality, making it an essential component for any FCCT (Filter Changer Camera Tilter) or custom filter drawer setup.\u003c\/p\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\"\u003eHow does the 47.4 mm FCCT Clearglass filter help when imaging the Pelican Nebula (IC 5070) with a 3nm Ha filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eImaging the Pelican Nebula (IC 5070) with a 3nm H-alpha filter results in a very dim image, making focusing difficult. You would use the \u003cstrong\u003eBaader FCCT Clearglass filter\u003c\/strong\u003e first to focus on a nearby bright star. Once sharp focus is achieved, you switch to the 3nm Ha filter. Because they are parfocal, your focus will be perfect, and you can begin imaging immediately without struggling with the dim nebula view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for this Baader Clearglass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means that this filter has the same optical thickness as other filters in Baader's CMOS-optimized line. This ensures that the focal point of your telescope does not shift when you switch between this clear filter and, for example, a Baader narrowband or LRGB filter. This eliminates the need to refocus with every filter change, which is a major time-saver during an imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the FCCT Clearglass filter just a plain piece of glass?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is an optical-grade window with advanced, multi-layer anti-reflection coatings. Unlike a simple piece of glass, the \u003cstrong\u003e\"CMOS-optimized\"\u003c\/strong\u003e coatings are designed to maximize light transmission and prevent halos, reflections, and other artifacts common with sensitive CMOS sensors. However, note that this is a clearglass filter; it is not a UV\/IR cut filter and should not be used as a luminance filter with refractors or other scopes that are not corrected outside the visual spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I'm using a monochrome camera and a filter wheel, where would I install the 2\" FCCT Clearglass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would typically install the \u003cstrong\u003eBaader 2\" FCCT Clearglass filter\u003c\/strong\u003e in an empty slot in your filter wheel, often designated as the \"Luminance\" or \"Focus\" position. This allows your software to automatically rotate to the clear filter for focusing routines (like a V-curve analysis) before switching to your R, G, B, or narrowband filters to capture data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this filter unmounted with a 47.4 mm diameter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e47.4 mm diameter\u003c\/strong\u003e and unmounted format are specifically for systems like the Baader FCCT (Filter Changer Camera Tilter) and other custom filter holders that require unmounted filters of this size. It provides a larger clear aperture than standard mounted 2\" filters, helping to prevent vignetting with larger sensors and fast optical systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Baader Clearglass filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile its primary design is for imaging, you could use it as a high-quality dust plug for your diagonal or eyepiece barrel. However, it offers no filtration or image enhancement for visual use. Its main value is realized in an astrophotography setup as a parfocal focusing tool.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eClearglass (Focusing \/ Dust Protection)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e47.4 mm\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\u003ctr\u003e\n\u003ctd\u003ePrimary Application\u003c\/td\u003e\n\u003ctd\u003eParfocal focusing for narrowband imaging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Application\u003c\/td\u003e\n\u003ctd\u003eSensor dust protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003efull Spectrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003edielectrically coated, planeoptically polished\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFCCT 2\" Unmounted Clearglass Filter (Ø 47.4 mm)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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\"\u003eBaader Planetarium Cleaning and Maintenance of Optics 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_FCCT_Filter_Changer_Camera_Tilter_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\"\u003eBaader Planetarium FCCT Filter Changer Camera Tilter 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 Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913179558173,"sku":"BAA-2458416U","price":82.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-FCCT-Filter-Clearglass-Filter-2-unmounted-47-4-mm-for-focusing-dust-protection-1_2f95b1ff-1d24-4174-ad29-2eecc2b32e6f.jpg?v=1789087359"},{"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\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eCMOS, CCD, IR-Cut, Luminance, UV-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003e420 – 685 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eReflex-Blocker™ hard coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable for f\/ratio\u003c\/td\u003e\n\u003ctd\u003ef\/15 to f\/1.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\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\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003e47.4 mm (2\" w\/o cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd\u003eUV\/IR-Cut\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\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01 (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003e31 mm (31mm)\u003cbr\u003e36 mm (36mm)\u003cbr\u003e50.4 mm (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial Features\u003c\/td\u003e\n\u003ctd\u003eCMOS-optimized with Life-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm (31mm, 36mm)\u003cbr\u003e3 mm (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd\u003eUV\/IR-Cut\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\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01 (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003e31 mm (31mm)\u003cbr\u003e36 mm (36mm)\u003cbr\u003e50.4 mm (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial Features\u003c\/td\u003e\n\u003ctd\u003eCMOS-optimized with Life-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm (31mm, 36mm)\u003cbr\u003e3 mm (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd\u003eUV\/IR-Cut\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\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.01 (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003e31 mm (31mm)\u003cbr\u003e36 mm (36mm)\u003cbr\u003e50.4 mm (50.4mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial Features\u003c\/td\u003e\n\u003ctd\u003eCMOS-optimized with Life-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e2 mm (31mm, 36mm)\u003cbr\u003e3 mm (50.4mm)\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\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.02\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial Features\u003c\/td\u003e\n\u003ctd\u003eCMOS-optimized with Life-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e3 mm\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\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial Features\u003c\/td\u003e\n\u003ctd\u003eCMOS-optimized with Life-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e50.4mm Round Unmounted Filter\u003c\/h3\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader UV\/IR-Cut \/ L-Filter 50.4mm\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFilter Storage Box\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e50x50mm Square Filter\u003c\/h3\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader UV\/IR-Cut \/ L-Filter 50x50mm\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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\"\u003eBaader Planetarium Cleaning and Maintenance of Optics 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\"\u003eBaader Planetarium Filter Problems FAQ 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_FCCT_Filter_Changer_Camera_Tilter_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\"\u003eBaader Planetarium FCCT Filter Changer Camera Tilter 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"},{"product_id":"player-one-uvenus-1-25-inch-uv-pass-filter-e-series","title":"Player One UVenus UV-Pass Filter E-series - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReveals Cloud Detail on Venus\u003c\/li\u003e\n\u003cli\u003eUV-Pass Band Optimized for Planetary Imaging\u003c\/li\u003e\n\u003cli\u003eE-Series High-Quality Optical Glass Substrate\u003c\/li\u003e\n\u003cli\u003e1.25\" Mounted Filter Format\u003c\/li\u003e\n\u003cli\u003eMulti-Layer Coatings for High Contrast\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\u003eUVenus 1.25″ UV-PASS Filter E-series\u003c\/h2\u003e\n\u003cp\u003eThe Player One UVenus 1.25″ UV-PASS Filter is engineered for the specific challenge of imaging Venus, isolating the ultraviolet wavelengths reflected by the planet's dense cloud tops. By rejecting visible and infrared light, this 1.25\" filter allows your CMOS or CCD camera to capture the subtle swirls and dark markings within Venus's atmosphere that are otherwise invisible.\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\u003eRevealing Venus's Atmosphere: A Dedicated UV-Pass Filter\u003c\/h3\u003e\n\u003cp\u003eTo the naked eye or a standard camera, Venus appears as a brilliant but featureless crescent. Its true atmospheric dynamics are hidden in the ultraviolet spectrum, where its sulphuric acid clouds show significant contrast. The UVenus filter is designed to transmit only this UV light, transforming Venus from a flat disc into a world with discernible weather patterns.\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\u003eE-Series Construction: High-Contrast Substrate and Coatings\u003c\/h3\u003e\n\u003cp\u003eAs part of Player One's E-series, the UVenus filter is built on a high-quality optical glass substrate for maximum image clarity. Multi-layer composite coatings are applied to both surfaces to ensure high transmission of the desired UV wavelengths while suppressing reflections and internal ghosting, which is critical for maintaining contrast against Venus's bright glare.\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\u003ePlayer One E-Series vs. S-Series Filters: What's the Upgrade?\u003c\/h3\u003e\n\u003cp\u003eThe E-series represents a significant step up from Player One's S-series filters. The key distinctions lie in the manufacturing standards and materials used.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Substrate:\u003c\/strong\u003e The E-series uses a higher grade of optical glass, resulting in a cleaner, more uniform transmission profile.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating Technology:\u003c\/strong\u003e E-series filters employ a more advanced multi-layer composite coating process, designed to deliver higher contrast and durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget Application:\u003c\/strong\u003e While S-series filters are excellent general-purpose tools, E-series filters are optimized for dedicated imagers seeking professional-level results from modern CMOS and CCD cameras.\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 do I need a UVenus filter to see clouds on Venus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eVenus's atmosphere is extremely thick and reflective, making it appear featureless in visible light. However, specific chemical absorbers in the upper cloud deck create dark patterns that are only visible in ultraviolet light. The \u003cstrong\u003ePlayer One UVenus filter\u003c\/strong\u003e isolates this specific part of the spectrum, allowing a monochrome camera to capture these elusive atmospheric details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the UVenus 1.25″ filter for anything other than Venus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile its primary purpose is imaging Venus, a UV-pass filter can also be used for specialized imaging of Jupiter's and Saturn's upper atmospheric hazes. However, its applications are limited. This is a highly specialized filter and is not suitable for general planetary, lunar, or deep-sky imaging, as it blocks all visible light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Player One E-series UVenus filter different from the S-series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe E-series is an upgraded line built to a higher standard. It uses a higher-quality optical glass substrate and more advanced multi-layer coatings compared to the S-series. This results in higher contrast and images better optimized for demanding CMOS and CCD astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the UVenus filter work with my monochrome planetary camera on an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. An 8\" SCT paired with a high-speed monochrome camera is an ideal setup for using the UVenus filter. The filter is optimized for modern CMOS\/CCD sensors, and the aperture of an 8\" telescope gathers enough light in the UV spectrum to allow for the short exposures needed to freeze atmospheric seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I see Venus's clouds visually with the UVenus filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The human eye is not sensitive to ultraviolet light. This filter blocks nearly all visible light, so when looking through it, you will see little to nothing. It is strictly an imaging filter designed for use with a camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need an Atmospheric Dispersion Corrector (ADC) when imaging Venus with the UVenus filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is highly recommended. Atmospheric dispersion is much more severe at ultraviolet wavelengths than in visible light. When Venus is at lower altitudes, an ADC is essential to correct for the color fringing caused by the atmosphere and achieve a sharp image with the UVenus filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eUV-Pass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eE-Series\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\/Player_One_2026_Product_Catalog_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\u003cp\u003e\u003ca title=\"Player One 2-Year Warranty\" href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":52913424793885,"sku":"POA-UV125E","price":209.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"player-one-ch4-8nm-1-25-inch-filter-e-series","title":"Player One CH4 8nm Filter E-series - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the 8nm methane (CH4) absorption band\u003c\/li\u003e\n\u003cli\u003eStandard 1.25″ filter cell format\u003c\/li\u003e\n\u003cli\u003eOptimized for modern CMOS and CCD planetary cameras\u003c\/li\u003e\n\u003cli\u003eE-series features high-quality optical glass and multi-layer coatings\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\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\u003eCH4 8nm 1.25″ Filter E-series\u003c\/h2\u003e\n\u003cp\u003eThe Player One CH4 8nm 1.25″ E-series Filter isolates the specific methane absorption band, darkening the methane-rich belts of Jupiter and Saturn to dramatically increase the visibility of high-altitude storms and atmospheric features. This E-series filter is built to a higher standard using high-quality optical glass and advanced multi-layer coatings, optimized for the high sensitivity of modern CMOS and CCD sensors.\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\u003eTargeting Gas Giants: The 8nm Methane Bandpass\u003c\/h3\u003e\n\u003cp\u003eMethane gas in the atmospheres of Jupiter and Saturn strongly absorbs sunlight. This filter's narrow 8nm bandpass is centered on this absorption line, making methane-rich areas appear very dark. Features at higher altitudes, above the main methane layers—such as bright equatorial zones and prominent storms like the Great Red Spot—reflect sunlight before it is absorbed and therefore stand out with exceptional contrast.\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\u003eE-Series Optics for CMOS\/CCD Imaging\u003c\/h3\u003e\n\u003cp\u003eThe E-series represents an upgrade in optical manufacturing, designed specifically for astrophotography with modern cameras. Each filter uses a high-quality glass substrate and multi-layer composite coatings to ensure high transmission within the narrow bandpass while suppressing unwanted out-of-band light. This construction minimizes halos and internal reflections, preserving the fine details captured by your 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\u003ePlayer One E-Series vs. S-Series: An Upgraded Standard\u003c\/h3\u003e\n\u003cp\u003ePlayer One offers two filter lines, and the E-series is the premium option for imagers seeking the best possible results. While the S-series provides excellent value, the E-series is manufactured to a higher standard.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate and Coatings:\u003c\/strong\u003e The E-series employs higher quality optical glass and more advanced multi-layer coating technology than the S-series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget Optimization:\u003c\/strong\u003e This upgraded construction is specifically aimed at maximizing the signal-to-noise ratio for sensitive CMOS and CCD cameras.\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\"\u003eWhat is the primary purpose of the Player One E-series CH4 8nm filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the \u003cstrong\u003ePlayer One CH4 8nm filter\u003c\/strong\u003e is to enhance the contrast of atmospheric features on Jupiter and Saturn. By selectively passing light only in the methane absorption band, it darkens the main cloud belts, making high-altitude phenomena like storms, ovals, and bright zones appear much more prominent in monochrome images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 8nm bandpass on the CH4 filter affect my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe narrow \u003cstrong\u003e8nm bandpass\u003c\/strong\u003e is a trade-off. It provides very high contrast by rejecting almost all light outside the methane line, but it also significantly dims the image. This requires longer exposure times or higher gain settings, making it best suited for planetary cameras with high sensitivity and low read noise. It is not suitable for visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main difference between the Player One E-series and S-series filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eE-series is an upgraded version of the S-series\u003c\/strong\u003e. According to Player One, the E-series uses a higher quality optical glass substrate and more advanced multi-layer composite coating technology. This results in a filter manufactured to a higher standard, optimized for professional results with modern CMOS and CCD cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 1.25\" E-series CH4 filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is designed exclusively for imaging. The 8nm bandpass is extremely restrictive and passes so little light that the image through an eyepiece would be far too dim for the human eye to see any detail. It relies on the ability of a camera sensor to accumulate light over time (long exposures).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the E-series CH4 filter improve my images of Jupiter with a C8 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a Celestron 8\" SCT, the \u003cstrong\u003ePlayer One CH4 filter\u003c\/strong\u003e will allow you to capture a high-contrast map of Jupiter's upper atmosphere. The Great Red Spot, which can sometimes have low contrast in visible light, will appear as a bright, high-altitude feature against the darkened South Equatorial Belt. You will also be able to more clearly define the structure of the bright Equatorial Zone and detect other smaller storms (ovals) that are difficult to resolve in broadband images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Player One CH4 filter useful for imaging Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003eCH4 filter\u003c\/strong\u003e is excellent for Saturn. It enhances the contrast of the planet's own atmospheric belts and zones, similar to its effect on Jupiter. Critically, it also darkens the planet's globe significantly more than the icy rings, which do not contain methane. This makes the rings stand out with brilliant separation from the planet itself, creating a striking and detailed image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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\n\u003cli\u003e\n\u003cp\u003e\u003ca title=\"Player One 2-Year Warranty\" href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":52913424957725,"sku":"POA-CH4-125E","price":181.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"player-one-ir685nm-1-25-inch-ir-pass-filter-s-series","title":"Player One IR685nm  IR-Pass Filter S-series - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003ePasses infrared light with wavelengths greater than 685nm\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" filter format for broad compatibility\u003c\/li\u003e\n\u003cli\u003eSignificantly improves image stability by reducing atmospheric seeing effects\u003c\/li\u003e\n\u003cli\u003eEnhances contrast for high-resolution lunar and planetary imaging\u003c\/li\u003e\n\u003cli\u003eS-Series construction with double-sided multi-layer coatings\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\u003ePlayer One IR685nm 1.25″ IR-Pass Filter S-series\u003c\/h2\u003e\n\u003cp\u003eThe Player One IR685nm 1.25″ IR-Pass Filter S-series isolates infrared light above the 685nm wavelength, arming your monochrome camera against poor atmospheric seeing. By blocking the shorter, more turbulent wavelengths of visible light, this filter transmits a more stable signal, allowing you to capture significantly sharper details on the Moon and planets through a standard 1.25\" filter thread.\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\u003eStabilize Seeing: Pass Only Wavelengths Above 685nm\u003c\/h3\u003e\n\u003cp\u003eAtmospheric turbulence, or \"seeing,\" is the primary barrier to sharp planetary imaging, as it scatters shorter wavelengths of light more severely. The IR685 filter combats this by creating a hard cutoff at 685nm, transmitting only deep red and near-infrared light which is far less susceptible to atmospheric distortion. This technique effectively \"freezes\" the image, revealing fine details that are otherwise blurred into a shimmering mess on nights of average seeing.\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\u003eHigh-Resolution Imaging in a 1.25\" Format\u003c\/h3\u003e\n\u003cp\u003eThe IR685 filter is a critical tool for extracting maximum lunar and planetary detail. For lunar imaging, the increased contrast in the infrared spectrum darkens the sky and sharpens the distinction between sunlit crater rims and shadowed floors. For planetary work, it's particularly effective for revealing faint, low-contrast features, most notably the elusive cloud bands of Uranus, a target where infrared imaging makes a decisive difference.\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\u003eS-Series Construction with Double-Sided Coatings\u003c\/h3\u003e\n\u003cp\u003eAs part of the Player One S-series, this filter is built on a high-quality optical glass substrate for maximum image fidelity. It features an upgraded double-sided, multi-layer composite coating that ensures high transmission of the desired infrared wavelengths while reflecting unwanted light. This advanced coating technology minimizes internal reflections and artifacts, preserving the high contrast needed for serious planetary work.\u003c\/p\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\"\u003eHow does the Player One IR685nm filter help when imaging Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn nights with unsteady air, the IR685nm filter will deliver a noticeably more stable image of Jupiter through an 8\" SCT. By cutting out the turbulent blue and green light, you can use longer exposures or higher gain to capture sharp infrared data of the cloud bands and the Great Red Spot. This data can then be used as a high-detail luminance layer for an RGB color image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Player One IR685nm filter to see the cloud bands on Uranus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is one of the primary applications for this filter. Uranus's cloud bands are notoriously faint in visible light but show significantly more contrast in the near-infrared spectrum. Using the IR685nm filter with a monochrome camera and a telescope of sufficient aperture is a proven method for successfully imaging these challenging features.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Player One IR685nm filter suitable for color cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is designed exclusively for \u003cstrong\u003emonochrome cameras\u003c\/strong\u003e. A color camera's sensor has a Bayer mask (red, green, and blue pixels) that blocks most of the infrared light from reaching the sensor, and only the red pixels would receive any significant signal. To take advantage of IR imaging, a monochrome camera is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of using the Player One IR685nm filter for lunar photography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main advantages are improved seeing and higher contrast. The IR685nm filter stabilizes the image, allowing you to resolve smaller craters, rilles, and mountain ranges. It also provides a \"daylight\" look to the lunar surface with very dark skies, making fine surface details stand out more clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Player One IR685nm filter work with my 1.25\" filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Player One IR685nm filter is housed in a standard 1.25\" cell with male M28.5x0.6 threads, making it fully compatible with any standard 1.25\" filter wheel, filter drawer, or eyepiece that accepts threaded filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Player One IR685nm filter compare to a standard red filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard red filter typically passes light from about 610nm upwards, including a significant amount of visible red light. The IR685nm filter provides a much deeper cut into the infrared, passing only light from 685nm and up. This results in a more dramatic improvement in seeing compared to a red filter, though it requires a camera with good sensitivity in the near-infrared.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eIR-Pass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-on Wavelength\u003c\/td\u003e\n\u003ctd\u003e685nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eS-Series\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eIR685nm 1.25″ IR-Pass Filter S-series\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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\/Player_One_2026_Product_Catalog_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\u003cp\u003e\u003ca title=\"Player One 2-Year Warranty\" href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":52913425318173,"sku":"POA-IR685","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/PlayerOne-IR685nm-1-25-IR-Pass-Filter-S-series-1_cdeb2d14-3be4-4fc2-9688-35e59747bd58.jpg?v=1789090900"},{"product_id":"player-one-ir850nm-1-25-inch-ir-pass-filter-s-series","title":"Player One IR850nm IR-Pass Filter S-series - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003ePasses Infrared Light at 850nm\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Filter Size\u003c\/li\u003e\n\u003cli\u003eBlocks Visible and Ultraviolet Light\u003c\/li\u003e\n\u003cli\u003eHigh-Quality Optical Glass Substrate\u003c\/li\u003e\n\u003cli\u003eMulti-Layer Anti-Reflection Coatings\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\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\u003ePlayer One IR850nm 1.25″ IR-Pass Filter S-series\u003c\/h2\u003e\n      \u003cp\u003eThe Player One IR850nm 1.25″ IR-Pass Filter isolates a narrow slice of the near-infrared spectrum centered at 850nm, blocking unwanted visible light to dramatically increase planetary contrast. Designed for the standard 1.25″ format, this filter is purpose-built to reveal high-contrast details on planets like Venus, which are only visible to a sensor sensitive to wavelengths beyond 850nm.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eRevealing Venus's Clouds at 850nm\u003c\/h3\u003e\n      \u003cp\u003eFor planetary imagers, Venus presents a unique challenge: a visually blank disc hiding a complex, dynamic atmosphere. The IR850nm filter is the key to unlocking it, allowing you to capture the faint thermal signatures of the planet's cloud tops. These structures are completely invisible in the visible spectrum but show remarkable detail in the near-infrared.\u003c\/p\u003e\n      \u003cp\u003eBy capturing data through this filter and combining it with images taken through an ultraviolet (UV) filter, you can create stunning composite photographs that show multiple layers of the Venusian atmosphere. This multi-band approach transforms the planet from a bright, featureless orb into a world of subtle swirls and patterns.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 850nm Advantage: Cutting Through Atmospheric Turbulence\u003c\/h3\u003e\n      \u003cp\u003eThe primary benefit of imaging at a long wavelength like 850nm is its ability to mitigate the effects of atmospheric seeing. Shorter wavelengths of light (like blue and green) are scattered more easily by turbulence in Earth's atmosphere, resulting in a soft, blurry image. Infrared light is far less affected, leading to a steadier, sharper final result.\u003c\/p\u003e\n      \u003cp\u003eThis makes the IR850nm filter an essential tool for high-resolution imaging of the Moon and other planets, especially on nights of average or poor seeing. It acts as a \"seeing stabilizer,\" allowing you to capture fine details like lunar rilles and Martian surface features that would otherwise be lost to atmospheric blurring.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary use of the Player One IR850nm filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Player One IR850nm filter is designed for high-resolution planetary and lunar imaging. It blocks visible light and passes only near-infrared light at 850nm, which significantly reduces the blurring effects of atmospheric turbulence (seeing) and reveals details on planets like Venus that are invisible in the visible spectrum.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the IR850nm filter help with imaging Venus?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eVenus's dense cloud cover appears almost featureless in visible light. The \u003cstrong\u003eIR850nm filter\u003c\/strong\u003e allows your camera's sensor to capture the thermal emissions and subtle variations in the upper cloud deck. This data can be combined with images taken through a UV filter to create a comprehensive, multi-spectral portrait of the planet's atmosphere.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the IR850nm filter for deep-sky imaging?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this filter is not recommended for deep-sky imaging. Most nebulae and galaxies are very faint in the near-infrared, and camera sensors have lower sensitivity at 850nm. This filter is specifically a tool for bright objects like the Moon and planets where cutting through atmospheric seeing is the primary goal.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25\" IR850nm filter work with my existing filter wheel and camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the \u003cstrong\u003ePlayer One IR850nm filter\u003c\/strong\u003e is housed in a standard 1.25\" cell with M28.5x0.6 threads. It is compatible with any standard 1.25\" filter wheel, filter drawer, or camera nosepiece that accepts threaded filters.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose an 850nm filter over a 685nm IR-pass filter for lunar imaging?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAn \u003cstrong\u003e850nm filter\u003c\/strong\u003e provides a greater seeing-reduction effect than a 685nm filter because its passband is further into the infrared spectrum. On nights of particularly poor seeing, the 850nm filter will deliver a steadier image. The trade-off is that less light is available at 850nm, requiring longer exposures or higher gain, which is why the 685nm is often used when seeing is more stable.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a monochrome or color camera for the IR850nm filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA \u003cstrong\u003emonochrome camera\u003c\/strong\u003e is strongly recommended. Color cameras have a Bayer matrix (a grid of red, green, and blue filters) over the sensor, which blocks a significant portion of the incoming infrared light and reduces both sensitivity and resolution. A monochrome sensor utilizes every pixel to capture the 850nm signal for the best possible result.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e850nm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eIR-Pass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eS-series\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eIR850nm 1.25″ IR-Pass Filter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eProtective Case\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cp\u003e\u003ca title=\"Player One 2-Year Warranty\" href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":52913425613085,"sku":"POA-IR850","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/PlayerOne-IR850nm-1-25-IR-Pass-Filter-S-series-1_43a3799c-a054-4fae-b2a3-c24eace4525e.jpg?v=1789090908"},{"product_id":"daystar-2-inch-uv-ir-filter","title":"Daystar 2\" UV\/IR Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2\" Barrel Size\u003c\/li\u003e\n\u003cli\u003eBlocks Ultraviolet (UV) and Infrared (IR) Wavelengths\u003c\/li\u003e\n\u003cli\u003ePasses the Full Visible Spectrum\u003c\/li\u003e\n\u003cli\u003eFunctions as an Essential Luminance (L) Filter\u003c\/li\u003e\n\u003cli\u003eReduces Star Bloat and Improves Sharpness in Refractors\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\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\u003e2\" UV\/IR Filter\u003c\/h2\u003e\n\u003cp\u003eThis 2\" UV\/IR Cut Filter is a fundamental tool for digital astrophotography, designed to isolate the visible spectrum that your telescope's optics are corrected for. By aggressively blocking unwanted ultraviolet and infrared light, it prevents the associated star bloat and loss of contrast common in refractive systems, resulting in a significantly sharper final image.\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\u003eUV\/IR Cut: Sharpening Images by Removing Unfocused Light\u003c\/h3\u003e\n\u003cp\u003eRefractor telescopes are designed to bring visible light to a sharp, single point of focus. However, UV and IR wavelengths focus at different planes, creating a form of chromatic aberration that softens the image and reduces fine detail. This filter solves the problem by simply removing that unfocused light before it ever reaches your camera sensor.\u003c\/p\u003e\n\u003cp\u003eBy eliminating these out-of-band wavelengths, stars become tighter, and contrast on planetary and deep-sky targets is noticeably improved. The filter also serves a secondary purpose by blocking thermal energy (IR), which can help reduce heat build-up in your downstream filters and diagonal during extended imaging sessions.\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\u003eThe Essential Luminance Filter for Refractor Astrophotography\u003c\/h3\u003e\n\u003cp\u003eFor monochrome LRGB imaging or when shooting with a One-Shot-Color (OSC) camera, this filter provides the critical luminance (L) signal. The luminance channel is responsible for all the image detail, and a clean signal containing only visible light is paramount for achieving the highest possible resolution.\u003c\/p\u003e\n\u003cp\u003eUsing this filter ensures that your luminance data is free from the bloating effects of IR and the low contrast caused by unfocused UV. It allows your sensor to capture every photon of the visible spectrum your refractor was built to resolve, producing a crisp, detailed foundation upon which to stack your color data.\u003c\/p\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 do I need a 2\" UV\/IR Cut Filter with my refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eRefractor lenses are corrected to focus visible light sharply. They do not focus ultraviolet (UV) and infrared (IR) light at the same point, which leads to soft, bloated stars and reduced image contrast. A UV\/IR Cut filter blocks these wavelengths, ensuring only the well-focused visible light reaches your camera sensor, resulting in a much sharper image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 2\" UV\/IR filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can, you are unlikely to notice any benefit. The human eye has very low sensitivity to the deep UV and IR wavelengths this filter blocks, so the visual image will appear largely unchanged. Its primary benefit is for digital sensors, which are highly sensitive to this out-of-band light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this 2\" UV\/IR Cut Filter help when imaging the Andromeda Galaxy (M31) with a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen imaging a galaxy like M31 with a one-shot-color (OSC) camera, your sensor is still capturing unfocused IR light, which causes stars to appear larger and more bloated, obscuring fine detail in the galaxy's dust lanes and star-forming regions. Using this filter cleans up the entire image by ensuring that every pixel, regardless of its color, is only recording sharp, focused visible light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this UV\/IR Cut filter the same as a light pollution filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, they serve different purposes. A \u003cstrong\u003eUV\/IR Cut filter\u003c\/strong\u003e blocks light at the invisible ends of the spectrum. A \u003cstrong\u003elight pollution filter\u003c\/strong\u003e (like a UHC or CLS filter) is designed to block specific, narrow bands of visible light associated with artificial lighting (e.g., sodium and mercury vapor lamps) while passing nebula emission lines. This filter will not reduce skyglow from city lights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2\" UV\/IR Cut Filter improve images from my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While this filter is particularly critical for refractors, it is also beneficial for reflector-based systems like Schmidt-Cassegrains (SCTs) and Newtonians. Though these scopes do not suffer from the same chromatic aberration, using a UV\/IR Cut filter as your luminance filter ensures all your LRGB filters are parfocal, meaning you won't have to refocus when switching between them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 2\" UV\/IR Cut Filter protect other equipment?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, by blocking infrared radiation, the filter also blocks a significant amount of heat. This can be beneficial in protecting more sensitive and expensive filters placed after it in the optical train, such as narrowband filters, from potential heat-related damage or degradation over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\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)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\" (M48x0.75 Threads)\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" UV\/IR Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWarranty information for this product is not available. Please contact us for details.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":52935165804829,"sku":"DAY-DSIUV2","price":175.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DaystarFilters-2-UV-IR-Filter-1_46accae2-51af-4a6a-bd27-5412a6c53c92.jpg?v=1789520828"},{"product_id":"optolong-clear-focusing-filter","title":"Optolong Clear Focusing Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAchieve Critical Focus with Dim Stars\u003c\/li\u003e\n\u003cli\u003eTransmission \u0026gt;98.5% Across the Visible Spectrum\u003c\/li\u003e\n\u003cli\u003eλ\/4 Transmitted Wavefront for Image Integrity\u003c\/li\u003e\n\u003cli\u003eParfocal with Other 1.85mm Optolong Filters\u003c\/li\u003e\n\u003cli\u003eFunctions as a High-Quality Sensor Dust Shield\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\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\u003eOptolong Clear Focusing Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Optolong Clear Focusing Filter is a dedicated utility filter designed to solve one of astrophotography's most persistent challenges: achieving perfect focus with dim stars. By passing over 98.5% of visible light, this filter ensures your focusing star is as bright as possible, a critical advantage when narrowband or light pollution filters would otherwise render it nearly invisible. Constructed from B270 glass with a transmitted wavefront of λ\/4 and a thickness of 1.85mm, it maintains the optical path's integrity, allowing you to focus with confidence before swapping to your imaging filter.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-danger\"\u003e\n      \u003cdiv class=\"DAV-section-center\"\u003e\n          \u003ch3\u003e\n\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" style=\"width: 20px; height: 20px; fill: currentColor; margin-right: 8px; vertical-align: text-bottom;\"\u003e\u003cpath d=\"M256 32c14.2 0 27.3 7.5 34.5 19.8l216 368c7.3 12.4 7.3 27.7 .2 40.1S486.3 480 472 480H40c-14.3 0-27.6-7.7-34.7-20.1s-7-27.8 .2-40.1l216-368C228.7 39.5 241.8 32 256 32zm0 128c-13.3 0-24 10.7-24 24V296c0 13.3 10.7 24 24 24s24-10.7 24-24V184c0-13.3-10.7-24-24-24zm32 224a32 32 0 1 0 -64 0 32 32 0 1 0 64 0z\"\u003e\u003c\/path\u003e\u003c\/svg\u003eCritical Safety Warning: Not for Solar Use\u003c\/h3\u003e\n          \u003cp\u003eThis filter is \u003cstrong\u003eNOT\u003c\/strong\u003e designed for solar observation. Looking at the Sun with this filter, or any filter not explicitly certified for safe solar viewing, will cause immediate and irreversible eye damage, including permanent blindness. Do not point your telescope at the Sun with this filter attached.\u003c\/p\u003e\n      \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAchieve Critical Focus with \u0026gt;98.5% Transmission\u003c\/h3\u003e\n      \u003cp\u003eNarrowband and aggressive light pollution filters drastically dim incoming starlight, making it difficult for autofocus routines to lock on or for you to judge manual focus accurately. The Optolong Clear Filter solves this by passing more than 98.5% of light across the entire 420-680nm visible spectrum. You simply use this filter to achieve a sharp, bright focus on a star, then swap it for your narrowband or LRGB filter to begin imaging, knowing your focus is already set.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eParfocal and Protective with λ\/4 Wavefront Flatness\u003c\/h3\u003e\n      \u003cp\u003eA focusing aid is useless if it degrades your image or shifts the focal point. The Optolong Clear Filter is made from B270 substrate polished to a λ\/4 transmitted wavefront with 30s parallelism, ensuring it won't introduce aberrations. Its 1.85mm thickness makes it parfocal with other Optolong filters of the same thickness, minimizing the need to refocus after a filter change. It also serves as an excellent dust shield, protecting your camera sensor or reducer optics from dust during long imaging sessions.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need the Optolong Clear Focusing Filter? Can't I just focus without a filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile you can focus without a filter, adding a narrowband or LRGB filter into the optical path will slightly shift the focal point. The Optolong Clear Focusing Filter has a thickness of \u003cstrong\u003e1.85mm\u003c\/strong\u003e, designed to be parfocal with other Optolong filters. By focusing with this filter first, you ensure the focal point is correctly set for when you swap to your imaging filter, saving time and guaranteeing sharp results.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong Clear Filter the same as a Luminance (L) filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. A Luminance filter is an imaging filter with specific UV and IR blocking characteristics. The Optolong Clear Filter is a utility filter designed purely for focusing. It passes a wider band of light (\u003cstrong\u003e\u0026gt;98.5%\u003c\/strong\u003e from 420-680nm) to maximize star brightness for focusing software and visual confirmation. It is not intended for capturing final image data.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Optolong Clear Filter help when imaging the Horsehead Nebula (B33) with a narrowband filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eImaging Barnard 33 requires a strong Hydrogen-alpha filter, which blocks almost all starlight except for a single wavelength. This makes focusing stars extremely dim and difficult. With the Optolong Clear Filter, you can select a nearby bright star like Alnitak, achieve perfect focus using the full visible spectrum, lock your focuser, and then switch to your Ha filter to capture the faint nebulosity without struggling to see the dim, red-only star.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong Clear Filter improve focusing with my modified DSLR and f\/5 Newtonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. A modified DSLR is more sensitive to a broader spectrum of light, and this filter's \u003cstrong\u003e\u0026gt;98.5%\u003c\/strong\u003e transmission takes full advantage of that. In an f\/5 Newtonian, stars will be bright and sharp through the Clear Filter, allowing your camera's live view or focusing software to achieve a much more accurate focus than with a light pollution or narrowband filter installed.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I leave the Optolong Clear Filter in the optical train as a dust shield?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. With its high-quality \u003cstrong\u003eB270\u003c\/strong\u003e substrate and \u003cstrong\u003eλ\/4\u003c\/strong\u003e wavefront, it will not degrade your image quality. It acts as an effective barrier, preventing dust from settling on your camera sensor or reducer optics during a long imaging night.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong Clear Filter for solar viewing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNO. ABSOLUTELY NOT.\u003c\/strong\u003e This filter provides no protection from the Sun's harmful radiation. Using it for solar observation will cause instant and permanent blindness. Only use filters specifically designed and certified for safe solar observation.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAverage Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;98.5% (420-680nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eOptolong Clear Focusing Filter (Selected Size)\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":52941924565277,"sku":"OPT-12401","price":34.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":52941924598045,"sku":"OPT-12402","price":42.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-Clear-focusing-filter-is-designed-to-highly-pass-the-visible-spectral-region-420-680nm-at-98-5-transmission-1_d5f8835e-290b-416b-b60e-680f79a67a1a.jpg?v=1789592420"},{"product_id":"optolong-night-sky-h-alpha-filter-ir-pass-630nm","title":"Optolong Night Sky H-Alpha IR Pass Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003ePasses Infrared Light \u0026gt;650nm\u003c\/li\u003e\n\u003cli\u003eBlocks Visible Light from 300-570nm\u003c\/li\u003e\n\u003cli\u003eAverage Transmission \u0026gt;90%\u003c\/li\u003e\n\u003cli\u003e1.85mm Thick Optical Glass Substrate\u003c\/li\u003e\n\u003cli\u003eλ\/4 Transmitted Wavefront\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" Mounted Sizes\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\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\u003eOptolong Night Sky H-Alpha IR Pass Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong Night Sky H-Alpha IR Pass Filter is a specialized tool for planetary imagers seeking to overcome atmospheric turbulence. By aggressively blocking visible light in the 300-570nm range and passing infrared wavelengths with over 90% average transmission, this filter isolates the steadiest light for a sharper luminance channel. The filter is built on a 1.85mm optical glass substrate with a λ\/4 transmitted wavefront, ensuring it preserves the detail captured by your telescope.\u003c\/p\u003e\n\u003cdiv class=\"DAV-warning-box\"\u003e\n\u003csvg viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M256 32c14.2 0 27.3 7.5 34.5 19.8l216 368c7.3 12.4 7.3 27.7 .2 40.1S486.3 480 472 480H40c-14.3 0-27.6-7.7-34.7-20.1s-7-27.8 .2-40.1l216-368C228.7 39.5 241.8 32 256 32zm0 128c-13.3 0-24 10.7-24 24V296c0 13.3 10.7 24 24 24s24-10.7 24-24V184c0-13.3-10.7-24-24-24zm32 224a32 32 0 1 0 -64 0 32 32 0 1 0 64 0z\" fill=\"#D70000\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e This filter is NOT for solar observation. DO NOT look at the Sun with this or any Optolong filter not explicitly designed for solar viewing. Failure to observe this warning will result in permanent blindness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSharpening Luminance Beyond 640nm for Planetary Imaging\u003c\/h3\u003e\n\u003cp\u003eAtmospheric seeing, the turbulence that blurs celestial objects, has a greater effect on shorter wavelengths of light like blue and green. The Optolong IR Pass filter defeats this by acting as a bouncer at the door; it completely blocks light below 570nm. It begins passing light around 640nm and achieves over 95% transmission beyond 650nm, capturing a signal composed of much steadier photons. \u003c\/p\u003e\n\u003cp\u003eWhen used as a replacement for a standard luminance (L) filter in an LRGB workflow, this IR-pass signal produces a dramatically sharper monochrome image. When you combine this superior IR luminance with your color RGB data, the final composite image reveals finer details in Jupiter's cloud bands, the Cassini Division in Saturn's rings, and subtle features on Mars.\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\u003eλ\/4 Wavefront and 1.85mm Substrate for Optical Purity\u003c\/h3\u003e\n\u003cp\u003eA filter is useless if it degrades the image your telescope produces. Optolong ensures optical integrity by using a high-quality glass substrate polished to a transmitted wavefront of λ\/4 or better. This level of precision means the filter will not introduce aberrations or distortions into the light path.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal Design:\u003c\/strong\u003e The \u003cstrong\u003e1.85mm\u003c\/strong\u003e substrate thickness is designed to be nearly parfocal with other common filters, minimizing the need to refocus when switching between filters in a wheel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Coatings:\u003c\/strong\u003e Ion-assisted deposition coatings provide resistance to scratching and ensure the filter's central wavelength (CWL) remains stable regardless of temperature changes during an imaging session.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Precision:\u003c\/strong\u003e A surface quality of \u003cstrong\u003e60\/40\u003c\/strong\u003e and parallelism of \u003cstrong\u003e30 arcseconds\u003c\/strong\u003e guarantee a clean, artifact-free image without internal reflections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIR Pass vs. Standard Luminance: A Specialist Filter for Seeing\u003c\/h3\u003e\n\u003cp\u003eWhile a standard luminance filter aims to capture the entire visible spectrum for maximum brightness, it also captures all the atmospheric blurring that comes with it. The Optolong H-Alpha IR Pass filter takes a different approach, prioritizing sharpness over total brightness by selectively choosing which light to record.\u003c\/p\u003e\n\u003cp\u003eA standard L-filter is a generalist, excellent for deep-sky objects where collecting every photon matters most. This IR Pass filter is a specialist. It intentionally discards the unsteady visible-spectrum light to create a superior luminance foundation for planetary IR-LRGB imaging, delivering a level of detail that a standard L-filter cannot achieve on nights of average or poor seeing.\u003c\/p\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\"\u003eCan I use the Optolong H-Alpha IR Pass filter to view the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e This filter is designed for night sky imaging and provides no protection from the Sun's harmful radiation. Looking at the Sun with this filter, even for a moment, will cause immediate and permanent eye damage, including blindness. Only use filters specifically designed and certified for safe solar observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Optolong IR Pass filter improve my images of Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eJupiter's low altitude for northern hemisphere observers often means looking through turbulent air. This filter cuts through that \"seeing\" by blocking the most easily scattered blue and green light (\u003cstrong\u003e300-570nm\u003c\/strong\u003e) and only passing the more stable, longer red and infrared wavelengths. The result is a much sharper black-and-white luminance image that can be combined with RGB data to show fine details in the Great Red Spot and intricate swirls in the cloud belts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong H-Alpha IR Pass filter useful for deep-sky imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, no. This filter is a specialist tool for planetary, lunar, and solar system imaging. For deep-sky objects like galaxies and nebulae, you want to collect as much light as possible across the visible spectrum. A standard Luminance (L) filter or narrowband filters (H-alpha, OIII, SII) are the correct tools for deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Optolong filter with my one-shot-color (OSC) camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for monochrome cameras to create a luminance channel, you can use it with a color camera. By enabling monochrome mode (or debayering the final image as black-and-white), you can capture a sharp IR-only image. However, its primary benefit is realized when combined with separate RGB data in an IR-LRGB composite, a technique best suited for monochrome cameras and filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to refocus my 8\" f\/10 SCT when switching to the Optolong 1.85mm IR Pass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1.85mm\u003c\/strong\u003e thickness is designed to be nearly parfocal with many other brands of 1.25\" and 2\" filters. While you should always check critical focus, the amount of adjustment needed will be minimal, if any. This is a significant advantage when using a filter wheel, as it saves time and prevents you from losing your target while refocusing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this filter called \"H-Alpha\" if it's an IR Pass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe name can be confusing. The filter's transmission starts to ramp up near the Hydrogen-alpha wavelength (656nm), so it passes H-alpha light and everything with a longer wavelength. However, its primary function isn't narrowband imaging but rather to serve as a very long-pass filter that uses the infrared spectrum to stabilize planetary images against atmospheric seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Material\u003c\/td\u003e\n\u003ctd\u003eOptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300-570nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30 arcseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOptolong Night Sky H-Alpha IR Pass Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Plastic Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":52941927121181,"sku":"OPT-12801","price":111.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":52941927153949,"sku":"OPT-12802","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-Night-Sky-H-Alpha-filter-IR-Pass-650nm-with-50-transition-from-blocking-to-passing-at-about-640nm-and-95-1_e2f058c9-b594-4cd2-a48c-cf16875a7fc1.jpg?v=1789592440"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/uv-ir-clear-and-specialty-filters.oembed","provider":"David Astro","version":"1.0","type":"link"}