{"title":"Filtres SVBONY","description":"\u003cp\u003eLes filtres SVBONY couvrent l'observation visuelle et l'astrophotographie. En imagerie, le jeu à bande étroite SV227 5nm (H-alpha, OIII, SII), le bibande SV220 7nm Ha\/OIII et le filtre SV260 à cinq bandes passantes isolent l'émission des nébuleuses malgré la pollution lumineuse, tandis que les filtres CLS et UHC aident en visuel. Pour la Lune et les planètes, on trouve des filtres lunaires et ND3.0, UV\/IR-cut et IR pass 685nm, ainsi que le SV231 Fringe Killer qui réduit le chromatisme des lunettes achromatiques.\u003c\/p\u003e","products":[{"product_id":"svbony-sv220-7nm-ha-oiii-dual-band-filter","title":"SVBONY SV220 7nm Ha\/OIII Dual-Band Filter","description":"","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52145332683037,"sku":"SV-W9172A","price":104.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52145332715805,"sku":"SV-W9172b","price":170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV220-7nm-Ha-OIII-Dual-Band-Filter.png?v=1784391995"},{"product_id":"svbony-sv220-3nm-h-alpha-and-oiii-dual-narrowband-filter","title":"SVBONY SV220 3nm H-Alpha \u0026 OIII Dual Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e3nm Dual-Bandpass:\u003c\/strong\u003e Isolates H-Alpha (656.3 nm) and OIII (500.7 nm) emission lines with extreme prejudice against light pollution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥85% Peak Transmittance:\u003c\/strong\u003e Captures maximum signal from faint nebulae by allowing more than 85% of target light to reach the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch Mounted Format:\u003c\/strong\u003e Standard Φ50.8mm cell with M48x0.75mm threads for compatibility with most filter wheels and camera nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm Clear Aperture:\u003c\/strong\u003e Provides an unvignetted field for full-frame sensors, ensuring even illumination from edge to edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD5 Blocking Depth:\u003c\/strong\u003e Suppresses unwanted wavelengths from 300nm to 1050nm with an optical density of 5, delivering a jet-black sky background.\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\u003eNarrowband Filter 3nm H-Alpha \u0026amp; OIII SV220 2inch\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV220 Narrowband Filter isolates the two most critical deep-sky emission lines with a tight 3nm bandpass centered at 656.3 nm for H-Alpha and 500.7 nm for OIII. This 2-inch filter achieves ≥85% peak transmittance for both wavelengths while its 44mm clear aperture eliminates vignetting on full-frame sensors. Mounted in a 7mm thick aluminum cell with standard M48x0.75mm threads, it delivers extreme contrast by blocking unwanted light with an average optical density of 5 across the 300-1050nm 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\u003eDual-Band 3nm Optics: Isolate H-Alpha and OIII with 85% Transmission\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV220 filter is its extremely narrow 3nm bandwidth. This design aggressively rejects light pollution, moonlight, and airglow, allowing only the specific light from ionized hydrogen (H-Alpha at 656.3 nm) and doubly ionized oxygen (OIII at 500.7 nm) to pass through. With an average peak transmittance of ≥85%, you capture maximum signal from emission nebulae, revealing faint, intricate structures that would otherwise be lost in the skyglow.\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\u003eFull-Frame Imaging: A 44mm Clear Aperture to Eliminate Vignetting\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern large-format sensors, the SV220's 2-inch housing features a 44mm light transmission aperture. This generous clear aperture prevents the vignetting or dimming at the corners of the frame that can occur with smaller filters on full-frame cameras. The standard M48x0.75mm male thread ensures broad compatibility with dedicated astronomy cameras, filter wheels, and telescope focusers, providing a secure, tilt-free connection.\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\u003eOD5 Blocking and λ\/4 Flatness: Suppressing Halos and Preserving Star Shape\u003c\/h3\u003e\n\u003cp\u003eBeyond the narrow bandpass, the SV220 uses a substrate with a transmitted wavefront of λ\/4 or better and parallelism of 30 arcseconds, ensuring that stars remain sharp and round. Multi-layer anti-reflection and anti-halo coatings, combined with an average OD5 blocking depth from 300nm to 1050nm, virtually eliminate halos around bright stars and produce a clean, high-contrast background. The filter is constructed from a 2.0mm thick substrate housed in a lightweight 12.5g 6061T aluminum cell for durability.\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\u003eSV220 Dual-Band vs. Mono Filters: Streamlining Your Imaging Sessions\u003c\/h3\u003e\n\u003cp\u003eFor one-shot-color (OSC) camera users, a dual-band filter like the SV220 offers a significant workflow advantage over a monochrome camera with a filter wheel and separate H-alpha and OIII filters. While a mono setup provides the ultimate in data control, the SV220 allows you to capture both critical emission lines simultaneously, cutting your total imaging time in half without swapping filters. This is especially valuable on nights with limited clear skies or when imaging targets that are only visible for a few hours.\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 advantage of the SVBONY SV220's 3nm dual-band design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003eextreme contrast and efficiency\u003c\/strong\u003e. The ultra-narrow 3nm bandwidth isolates the key H-Alpha (656.3 nm) and OIII (500.7 nm) wavelengths, aggressively blocking light pollution. By capturing both bands at once, it dramatically reduces the imaging time required compared to using separate monochrome filters, making it ideal for OSC camera users.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV220 2-inch filter work with my full-frame camera and filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SVBONY SV220 is designed specifically for this application. It uses a standard 2-inch mounted cell (Φ50.8mm) with M48x0.75mm threads, which is the standard for most 2-inch filter wheels and camera nosepieces. Its 44mm clear aperture is large enough to fully illuminate full-frame sensors without causing vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV220 3nm filter perform on the Orion Nebula (M42) from a light-polluted suburb?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV220 is ideal for this scenario. The Orion Nebula (M42) is rich in both H-Alpha and OIII emission. The filter's 3nm bandpass will reject nearly all city light, revealing the faint, extended nebulosity of the outer loops and the intricate detail within the Trapezium region that is normally washed out by skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV220 filter with my fast f\/4 Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can, be aware of a potential trade-off. Very narrow filters like this 3nm model can experience a slight \"band-shift\" with very fast optical systems (typically f\/4 and below). This means the filter's center wavelength can shift slightly, potentially reducing transmission. For optimal results with this filter, systems of f\/4.5 or slower are recommended, but it can still yield excellent results at f\/4, especially on bright targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the OD5 blocking depth on the SV220 filter mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD5 means Optical Density 5\u003c\/strong\u003e, which is a measure of how well the filter blocks unwanted light. It signifies that the filter allows only 1\/100,000th of the light outside its bandpass to get through. This deep blocking across the 300-1050nm range is critical for creating a dark, high-contrast background and preventing sensor bloat from bright stars and near-infrared light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV220 H-Alpha \u0026amp; OIII filter suitable for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, no. Galaxies like the Andromeda Galaxy (M31) are broadband targets, meaning their light comes from stars emitting across the entire visible spectrum. A narrowband filter like the SV220 will block almost all of this light. It is specifically designed for \u003cstrong\u003eemission nebulae\u003c\/strong\u003e, such as the North America Nebula (NGC 7000) or the Veil Nebula (NGC 6960), which glow brightly at the H-Alpha and OIII wavelengths.\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\u003eProduct Size\u003c\/td\u003e\n\u003ctd\u003e2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Dimensions\u003c\/td\u003e\n\u003ctd\u003eΦ50.8 × 7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM48 × 0.75 mm (Male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM)\u003c\/td\u003e\n\u003ctd\u003eH-alpha: 3±1 nm, OIII: 3±1 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelengths\u003c\/td\u003e\n\u003ctd\u003eH-alpha: 656.3 nm, OIII: 500.7 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥85% Average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300–1050 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eAverage OD5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Flatness\u003c\/td\u003e\n\u003ctd\u003e≤ λ\/4 Transmitted Wavefront\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30″\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\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e2.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e6061T Aluminum Extrusion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g\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\"\u003eSV220 H-Alpha \u0026amp; OIII Dual Narrowband Filter (3nm \/ 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":52861233234205,"sku":"SV-W9198A","price":168.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861233266973,"sku":"SV-W9198B","price":350.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Narrowband-Filter-3nm-H-Alpha-OIII-SV220-2inch-1_470fd306-4266-4f42-977d-da10a2a07ca4.jpg?v=1788659986"},{"product_id":"svbony-moon-filter","title":"SVBONY Moon Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces glare for comfortable lunar and planetary observing\u003c\/li\u003e\n\u003cli\u003eFits any standard 1.25\" eyepiece or accessory\u003c\/li\u003e\n\u003cli\u003eStandard M28.5x0.6 filter threads\u003c\/li\u003e\n\u003cli\u003eEnhances contrast on bright celestial objects\u003c\/li\u003e\n\u003cli\u003eConstructed with a 1.85mm thick optical glass 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\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 1.25\" Moon Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY 1.25\" Moon Filter is an essential accessory for observing bright celestial objects, built on a 1.85mm glass substrate to ensure optical flatness. It threads directly into any standard 1.25\" eyepiece with its M28.5x0.6 threads, dimming the overwhelming glare of the Moon to reveal subtle surface detail. This filter improves contrast not just on the Moon, but on bright planets as well.\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\u003eReduce Glare with a 1.85mm Contrast-Boosting Filter\u003c\/h3\u003e\n\u003cp\u003eViewing the Moon, especially during its brighter phases, can be uncomfortably dazzling and wash out fine details. This filter reduces the overall brightness, acting like sunglasses for your telescope, which allows your eye to relax and perceive more subtle features like crater rays, rilles, and variations in mare composition. The 1.85mm thick optical glass is designed as a multi-bandpass filter that also helps darken the sky background, increasing the contrast between your target and the surrounding space.\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\u003eUniversal Fit: M28.5x0.6 Threads for 1.25\" Eyepieces\u003c\/h3\u003e\n\u003cp\u003eEngineered for maximum compatibility, the SVBONY Moon Filter features standard M28.5x0.6 threads. This ensures it can be screwed directly onto the barrel of any 1.25\" eyepiece, diagonal, or camera nosepiece. The durable, anodized metal housing protects the glass element, and its low-profile design allows it to be stacked with other filters, such as a color filter for planetary observation, to further isolate specific details.\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 SVBONY 1.25\" Moon Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the SVBONY 1.25\" Moon Filter is to reduce the intense glare from the Moon, making observation more comfortable and revealing finer surface details that are otherwise washed out by the brightness. It also enhances contrast on bright planets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY 1.25\" Moon Filter on planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While designed for the Moon, the SVBONY 1.25\" filter's glare-reducing properties are also effective for observing bright planets. It can help cut through the brightness of Jupiter and Venus, making it easier to see subtle cloud bands or phase details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the SVBONY 1.25\" Moon Filter to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter is not attached to the telescope itself, but to your 1.25\" eyepiece or accessory. Simply screw the filter into the M28.5x0.6 threads on the bottom of your eyepiece barrel before inserting the eyepiece into the focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY 1.25\" Moon Filter help with city light pollution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe source description notes it helps darken the sky background by filtering some wavelengths from man-made lighting. While it is not a dedicated deep-sky light pollution filter (like a UHC or CLS), it can provide a modest improvement in contrast on brighter objects observed from suburban skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this SVBONY filter compatible with a 2\" eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this specific model is the 1.25\" version with M28.5x0.6 threads and will not fit a 2\" eyepiece. SVBONY also manufactures a 2\" version (with M48x0.75 threads) for observers using larger format eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY 1.25\" Moon Filter for imaging the Moon with my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's very useful for lunar imaging. The Moon is bright enough to saturate camera sensors with very short exposures. Using the SVBONY 1.25\" Moon Filter allows you to use longer, more manageable exposure times, which can reduce noise and prevent blowing out highlights in bright areas like the crater Tycho.\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\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Models\u003c\/td\u003e\n\u003ctd\u003eF9114A (1.25\"), F9114L (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Type\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6 (1.25\"), M48x0.75 (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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 1.25\" Moon 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\"\u003ePlastic Protective 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":52861233299741,"sku":"SV-F9114L","price":16.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861233332509,"sku":"SV-F9114A","price":20.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-1-25-Moon-Filter-Reduce-Glare-Optical-Glass-for-Telescope-1_d0fe9cfa-567e-4225-93aa-85aa17ec3b02.jpg?v=1788659999"},{"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-uhc-ultra-high-contrast-light-pollution-filter","title":"SVBONY UHC Ultra High Contrast Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces light pollution from artificial lighting\u003c\/li\u003e\n\u003cli\u003eEnhances contrast for emission nebulae\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\", 2\", and Canon EOS-C formats\u003c\/li\u003e\n\u003cli\u003eDurable aluminum frame with high-quality optical glass\u003c\/li\u003e\n\u003cli\u003eIncludes a protective 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\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 UHC Filter for Light Pollution Reduction\u003c\/h2\u003e\n\u003cp\u003eThe Svbony UHC Filter, available in 1.25\", 2\", and EOS-C formats, isolates critical nebular emission lines from city light pollution. This Ultra High Contrast design significantly darkens the sky background, making faint structures in objects like the Orion Nebula (M42) visible even from suburban locations. By selectively filtering out disruptive wavelengths from sodium and mercury vapor lamps, it restores the deep-sky views lost to urban 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\u003eDefeating Light Pollution: The UHC Advantage\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Svbony UHC filter is to create a starker contrast between your target nebula and the sky. It achieves this by selectively rejecting the most common wavelengths associated with artificial streetlights and other urban light sources. This surgical removal of unwanted light darkens the sky background without eliminating the key hydrogen-beta and oxygen-III wavelengths emitted by planetary and emission nebulae.\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\u003eMaximizing Contrast on Emission Nebulae\u003c\/h3\u003e\n\u003cp\u003eThis filter is a specialized tool designed to make emission nebulae \"pop\" in the eyepiece or on a camera sensor. For visual observers in light-polluted areas, faint objects like the Lagoon Nebula (M8) or the Swan Nebula (M17) transform from indistinct smudges into structured objects with discernible detail. The filter effectively boosts the signal-to-noise ratio, revealing faint wisps of nebulosity that are otherwise completely washed out by the skyglow.\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\u003eBuilt for Durability in Multiple Formats\u003c\/h3\u003e\n\u003cp\u003eConstructed with a durable, black-anodized aluminum frame and high-quality optical glass, the Svbony UHC filter is built for repeated use in the field. The filter is available in multiple formats to suit your equipment: standard 1.25\" and 2\" barrels that thread into most eyepieces and accessories, and a clip-in EOS-C model for Canon DSLR astrophotography. Each filter ships in a sturdy, transparent case to protect it from dust and scratches during storage and transport.\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 UHC vs. CLS Filters: Choosing the Right Tool\u003c\/h3\u003e\n\u003cp\u003eWhile both UHC and CLS (City Light Suppression) filters fight light pollution, they serve different purposes. A CLS filter is a more broadband option, which is better for maintaining natural star colors and viewing a wider variety of objects, including galaxies and reflection nebulae.\u003c\/p\u003e\n\u003cp\u003eThe Svbony UHC filter is more aggressive and has a narrower bandpass. This results in a much darker sky and higher contrast specifically on emission nebulae, but it comes at the cost of dimming stars more significantly and altering their color. For pulling the faintest details out of planetary and emission nebulae, the UHC is the superior choice; for general-purpose skyglow reduction, a CLS may be more suitable.\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 difference between the Svbony UHC and a CLS filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSvbony UHC (Ultra High Contrast) filter\u003c\/strong\u003e is a narrowband filter that provides maximum contrast on emission and planetary nebulae by aggressively blocking most light pollution. A \u003cstrong\u003eCLS (City Light Suppression) filter\u003c\/strong\u003e is more broadband, offering milder light pollution reduction but better performance on galaxies and clusters, with more natural star colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Svbony UHC filter improve my view of the Orion Nebula (M42) with an 8\" SCT from the suburbs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a suburban backyard, an 8\" SCT will show the core of the Orion Nebula (M42), but the outer loops of nebulosity are often lost in the skyglow. The Svbony UHC filter will dramatically darken the background sky, making the faint, extended wings of the nebula stand out clearly and revealing more intricate detail within the Trapezium region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony UHC filter for photographing the North American Nebula (NGC 7000) with a DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Svbony UHC filter is an excellent choice for DSLR imaging of large H-alpha regions like the North American Nebula (NGC 7000). The EOS-C clip-in version is specifically designed for this purpose. It will help separate the nebula's faint red glow from a light-polluted background, allowing you to use longer exposures to capture more detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony UHC filter make galaxies or star clusters brighter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it will make them fainter. Galaxies and star clusters are broadband objects, meaning they emit light across the entire visible spectrum. Because the UHC filter blocks large portions of this spectrum to fight light pollution, it will dim these objects. This filter is specifically designed for emission and planetary nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Svbony UHC filter format (1.25\", 2\", or EOS-C) do I need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe choice depends on your equipment:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" Filter:\u003c\/strong\u003e For use with standard 1.25\" eyepieces and accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" Filter:\u003c\/strong\u003e For use with larger 2\" eyepieces and accessories, typically for wide-field views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEOS-C Filter:\u003c\/strong\u003e A clip-in filter designed to fit inside the body of a Canon DSLR camera with an APS-C sensor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow should I clean my Svbony UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, use a blower bulb to remove any loose dust. If smudges or fingerprints remain, gently wipe the surface in a circular motion with a clean microfiber cloth and a few drops of a dedicated optical cleaning solution. Avoid using harsh chemicals or abrasive materials.\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSvbony UHC 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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Storage 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":52861233955101,"sku":"SV-F9131A","price":34.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861233987869,"sku":"SV-F9131B","price":60.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C Clip-In","offer_id":52861234020637,"sku":"SV-F9131D","price":70.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-UHC-Filter-1-25-2-EOS-C-Light-Pollution-Telescope-Photography-1_f10b7e09-bcc9-447c-833a-018f1dfba599.jpg?v=1788660034"},{"product_id":"svbony-sv155-7-piece-telescope-filter-set-125in","title":"SVBONY SV155 7-Piece Telescope Filter Set - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e7-Piece Filter Set\u003c\/li\u003e\n\u003cli\u003eIncludes Moon, CPL, and 5 Color Filters\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch Barrel Size\u003c\/li\u003e\n\u003cli\u003eM28.5*0.6 Filter Threads\u003c\/li\u003e\n\u003cli\u003e2mm Thick 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 SV155 1.25 inch 7-Piece Telescope Filter Set\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV155 7-piece filter set equips your 1.25-inch eyepieces for detailed lunar and planetary observation. This kit includes 7 essential filters—a Moon filter, a Circular Polarizing (CPL) filter, and 5 distinct color filters—all constructed from 2mm thick optical glass. Each filter threads directly into any standard 1.25-inch eyepiece with M28.5*0.6 threads, providing an immediate and noticeable boost in contrast on specific celestial targets.\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 7-Piece Set for Lunar and Planetary Contrast\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive kit is designed as a powerful starter pack for visual observers. The 7 filters provide the tools needed to manage the overwhelming brightness of the Moon and to selectively enhance subtle details on the planets, which are often washed out by atmospheric turbulence or the planet's own brightness. Instead of a single, generic filter, you get a specialized selection to tackle specific observational challenges.\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\u003eCPL \u0026amp; Moon Filters: Cutting Glare on Bright Targets\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon without a filter can be uncomfortably bright, causing your pupil to constrict and hiding faint surface features. The included Moon filter acts like a pair of sunglasses for your telescope, reducing overall brightness to reveal subtle rilles, crater walls, and mare textures. The CPL filter goes a step further by specifically blocking polarized light, which dramatically increases contrast not only on the Moon but also on planetary surfaces and atmospheres.\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\u003e5 Planetary Color Filters: Isolating Specific Surface Details\u003c\/h3\u003e\n\u003cp\u003eColor filters work by blocking certain wavelengths of light, which makes features of a complementary color stand out more clearly. This is a classic technique for bringing out faint details on planets that are otherwise invisible. The SV155 set includes five of the most useful planetary filters for visual work.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e#23A Bright Red:\u003c\/strong\u003e Sharpens boundaries of Mars' polar ice caps and enhances surface details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#21 Orange:\u003c\/strong\u003e Increases contrast in Jupiter's cloud belts and helps reveal the Great Red Spot. Also useful for sharpening details on Mars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#12 Yellow:\u003c\/strong\u003e Brings out reddish and orange features on Jupiter and Saturn, and enhances crater details on the Moon.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#56 Bright Green:\u003c\/strong\u003e Enhances the view of ice fogs on Mars and improves contrast within Saturn's ring system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#82A Bright Blue:\u003c\/strong\u003e Accentuates atmospheric details, like the cloud belts and zones on Jupiter and Saturn.\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\u003eUniversal 1.25\" Fit with M28.5*0.6 Threads\u003c\/h3\u003e\n\u003cp\u003eEach of the 7 filters in the SV155 set is housed in a durable aluminum alloy cell and features standard M28.5*0.6 threads. This ensures compatibility with virtually any 1.25-inch (31.7mm) telescope eyepiece, filter wheel, or camera nosepiece on the market. The 2mm thick optical glass is ground and polished to maintain the integrity of your optical train, ensuring you see planetary details without added distortion.\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 the SVBONY SV155 7-piece filter set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV155 set is designed for visual observers to enhance contrast and detail on the Moon and planets. The \u003cstrong\u003eMoon and CPL filters\u003c\/strong\u003e reduce glare from bright objects, while the \u003cstrong\u003efive color filters\u003c\/strong\u003e selectively block parts of the light spectrum to make specific features, like Jupiter's cloud bands or Mars' polar caps, easier to see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich filter from the SV155 set is best for viewing Jupiter's Great Red Spot?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e#21 Orange filter\u003c\/strong\u003e is the most effective in the SV155 set for enhancing Jupiter's Great Red Spot. It increases the contrast between the reddish spot and the surrounding lighter cloud zones. The \u003cstrong\u003e#82A Bright Blue filter\u003c\/strong\u003e is also useful for highlighting the boundaries of Jupiter's belts and zones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the CPL filter in the SV155 set differ from the Moon filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eMoon filter\u003c\/strong\u003e is a neutral density filter; it reduces the brightness of all colors of light equally, acting like sunglasses to make viewing more comfortable. The \u003cstrong\u003eCPL (Circular Polarizing) filter\u003c\/strong\u003e specifically blocks polarized light, which is often reflected glare. This not only reduces brightness but can also significantly increase surface contrast, making it useful for planets as well as the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV155 filters fit my telescope's 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SVBONY SV155 filters feature standard \u003cstrong\u003eM28.5*0.6 threads\u003c\/strong\u003e and are designed for a \u003cstrong\u003e1.25-inch (31.7mm)\u003c\/strong\u003e barrel. They will screw directly into the base of almost any 1.25-inch eyepiece, regardless of the telescope brand.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are there five different colors in the SV155 filter set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDifferent colors are used to highlight specific features on different planets. A filter works by passing its own color while blocking others, which increases the contrast of features that have a complementary color. For example:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA \u003cstrong\u003ered filter\u003c\/strong\u003e helps see surface features on Mars.\u003c\/li\u003e\n\u003cli\u003eA \u003cstrong\u003eblue filter\u003c\/strong\u003e helps see atmospheric clouds on Jupiter and Saturn.\u003c\/li\u003e\n\u003cli\u003eAn \u003cstrong\u003eorange filter\u003c\/strong\u003e helps see details within Jupiter's belts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the SVBONY SV155 filters made of glass or plastic?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV155 filters are made with \u003cstrong\u003e2mm thick optical glass\u003c\/strong\u003e lenses set in anodized aluminum alloy frames for durability and clear, distortion-free views.\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\u003eColor Filter, Moon Filter, CPL Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.7mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5*0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003eGood\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\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861234446621,"sku":"SV-F9135A","price":38.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV155-1-25-inch-7-Piece-Filters-Set-for-Moon-Viewing-Telescope-Filter-1_9ad2a52d-c2c9-4f1e-9fdd-354f1685e58f.jpg?v=1788660045"},{"product_id":"svbony-sv128-variable-polarizing-filter","title":"SVBONY SV128 Variable Polarizing Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" barrel sizes\u003c\/li\u003e\n\u003cli\u003eContinuously variable light transmission\u003c\/li\u003e\n\u003cli\u003eReduces glare for enhanced lunar and planetary contrast\u003c\/li\u003e\n\u003cli\u003eConstructed with optical glass lenses\u003c\/li\u003e\n\u003cli\u003eHoused in a durable aluminum frame\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 SV128 1.25\"\/2\" Variable Polarizing Filter\u003c\/h2\u003e\n      \u003cp\u003eThe SVBONY SV128 Variable Polarizing Filter, available in standard 1.25-inch and 2-inch formats, gives you direct, continuous control over image brightness. By rotating the filter housing, you smoothly adjust the light transmission to dial in the perfect view, making it an essential tool for reducing overwhelming glare from the Moon and bright planets 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\u003eFine-Tune Lunar \u0026amp; Planetary Views: Glare Control for 1.25\" \u0026amp; 2\" Setups\u003c\/h3\u003e\n      \u003cp\u003eA full Moon viewed through a telescope can be uncomfortably bright, washing out subtle details like crater rays and rilles. The SV128 Variable Polarizing Filter acts like a dimmer switch for your eyepiece, allowing you to reduce the Moon's glare to a comfortable level. This enhances contrast, revealing fine surface features that are otherwise lost in the brightness.\u003c\/p\u003e\n       \u003cp\u003eThis level of control is also critical for observing bright planets like Venus and Jupiter. By toning down their intensity, you can more easily resolve cloud bands, the Great Red Spot, or the phases of Venus. The filter consists of two polarizing elements; rotating one relative to the other adjusts the degree of light reduction to match your target and viewing conditions.\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\u003eDurable Construction: Optical Glass in an Aluminum Frame\u003c\/h3\u003e\n      \u003cp\u003eThe SV128 filter is built with optical glass lenses set in a sturdy aluminum frame, ensuring image clarity and long-term durability. The standard filter threads allow for quick and easy attachment to any standard 1.25-inch or 2-inch eyepiece or accessory.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eOptical Glass Lens:\u003c\/strong\u003e Maintains the optical integrity of your telescope, providing clear views with minimal degradation.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAluminum Frame:\u003c\/strong\u003e Provides a robust, non-flexing housing for the optics and smooth rotation for adjustment.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e Due to its thickness, this polarizing filter is not suitable for use in thin filter drawers like the SVBONY SV226.\u003c\/li\u003e\n      \u003c\/ul\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 SV128 Variable Polarizing Filter work?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe SV128 filter uses \u003cstrong\u003etwo high-quality polarizing glass elements\u003c\/strong\u003e. As you rotate the filter housing, the alignment of these two elements changes, which controls the amount of light that can pass through. This allows for a smooth, continuous adjustment of brightness, unlike fixed neutral density filters which have a set transmission level.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the SV128 filter for observing the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit for lunar observation is \u003cstrong\u003eglare reduction\u003c\/strong\u003e. A bright Moon, especially at phases greater than a quarter, can be dazzling and reduce your eye's dark adaptation. The SV128 allows you to dim the view to a comfortable level, which dramatically increases contrast and makes it easier to see fine details like crater walls, rilles, and mountain ranges along the terminator.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV128 filter to see more detail on Jupiter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. Jupiter is another very bright target where a variable polarizer is useful. By slightly reducing its brightness with the SV128, you can better resolve the contrast between its faint cloud bands and zones. This can make features like the Great Red Spot and smaller ovals stand out more clearly, especially in larger aperture telescopes.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich size SV128 filter do I need, 1.25\" or 2\"?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou should choose the filter size that matches the barrel size of your eyepieces. If you primarily use \u003cstrong\u003e1.25-inch eyepieces\u003c\/strong\u003e, select the 1.25\" filter. If you use larger \u003cstrong\u003e2-inch eyepieces\u003c\/strong\u003e for wide-field views, the 2\" filter is the correct choice. The filter threads directly onto the bottom of the eyepiece barrel.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV128 filter compatible with filter wheels?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eGenerally, no. The SV128 is significantly thicker than standard color or nebula filters because of its rotating, dual-element design. It is \u003cstrong\u003etoo thick to fit in most filter wheels or thin filter drawers\u003c\/strong\u003e, such as the SVBONY SV226. It is designed to be threaded directly onto an eyepiece or other accessory.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan the SV128 filter be used for daytime terrestrial viewing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it's very effective for terrestrial use. Just like polarized sunglasses, the SV128 can reduce glare from reflective surfaces like water, sand, or snow. This increases contrast and makes for more comfortable daytime viewing through 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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eVariable Polarizing Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eOptical glass lens, Aluminum Frame\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\"\u003eSV128 Variable Polarizing 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\"\u003ePlastic Storage 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":52861234741533,"sku":"SV-F9147A","price":25.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861234774301,"sku":"SV-F9147B","price":27.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV128-1-25-2inch-Variable-Polarizing-Filters-for-Telescope-1-F9147B_dea54dd1-64af-46d4-899b-e9583b1248ca.jpg?v=1788660055"},{"product_id":"svbony-cls-light-pollution-broadband-filter","title":"SVBONY CLS Light Pollution Broadband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBroadband Light Pollution Suppression\u003c\/li\u003e\n\u003cli\u003eEffectively Blocks Sodium and Mercury Vapor Streetlights\u003c\/li\u003e\n\u003cli\u003eHigh Transmission on Key Nebula Emission Lines\u003c\/li\u003e\n\u003cli\u003eOptimized for Color Cameras and Unmodified DSLRs\u003c\/li\u003e\n\u003cli\u003eDurable, Scratch-Resistant Optical Coatings\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\", 2\", and EOS-C Formats\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\u003eSvbony CLS Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe Svbony CLS Filter is a broadband light pollution filter designed to dramatically increase the contrast of deep-sky objects when imaging from urban and suburban skies. By selectively blocking common sources of artificial skyglow, such as sodium and mercury vapor streetlights, it reveals faint nebula structures that would otherwise be lost. This filter is an essential tool for astrophotographers using color CCD cameras or unmodified DSLRs, isolating key emission wavelengths to make targets like the Orion Nebula (M42) stand out against a darker background.\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 CLS: Suppressing Sodium \u0026amp; Mercury Vapor Skyglow\u003c\/h3\u003e\n\u003cp\u003eThe primary role of the Svbony CLS (City Light Suppression) filter is to reject the most common wavelengths of light pollution. It aggressively targets the spectral lines produced by sodium and mercury-vapor lamps, the dominant sources of skyglow in most urban environments. This selective blocking darkens the sky background in your images, significantly improving the signal-to-noise ratio. The practical result is that you can capture longer exposures from your backyard before the sensor is overwhelmed by skyglow, revealing fainter details in your target.\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 Nebulae: Passing Hydrogen \u0026amp; Oxygen Emission Lines\u003c\/h3\u003e\n\u003cp\u003eWhile blocking unwanted light, the Svbony CLS filter allows the most important wavelengths for deep-sky imaging to pass through to your camera sensor. It is designed for high transmission of critical emission lines, including Hydrogen-alpha, Hydrogen-beta, Oxygen-III, and Sulphur-II. Since these are the specific wavelengths emitted by popular targets like the North American Nebula (NGC 7000) and the Lagoon Nebula (M8), the filter makes these objects \"pop\" with enhanced contrast and color saturation, even with an unmodified DSLR.\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\u003eAdvanced Coatings: Ion-Assisted Deposition for Longevity\u003c\/h3\u003e\n\u003cp\u003eSvbony utilizes an advanced electron-beam gun evaporation process with ion-assisted deposition to create the filter's multi-layer coatings. This technology produces a dense, durable, and scratch-resistant surface that ensures consistent performance for years without degradation. A planetary rotation system during the coating process guarantees excellent homogeneity across the filter, providing uniform transmission and blockage for sharp, high-contrast images from edge to edge.\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 CLS vs. UHC Filters: Choosing the Right Tool for Your Sky\u003c\/h3\u003e\n\u003cp\u003eWhile both CLS and UHC (Ultra High Contrast) filters fight light pollution, they do so differently. A UHC filter is more aggressive, with a narrower passband focused almost exclusively on the Oxygen-III and Hydrogen-beta lines. This provides maximum contrast on planetary nebulae but can result in unnatural star colors.\u003c\/p\u003e\n\u003cp\u003eThe Svbony CLS filter's broader passband is a more balanced approach. It allows more light through, which yields more natural star colors and performs better on broadband targets like galaxies and reflection nebulae. For imagers with color cameras seeking a versatile, all-purpose light pollution filter, the Svbony CLS is often the superior starting point.\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 will the Svbony CLS filter improve my images of the Orion Nebula (M42) from my backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Svbony CLS filter will darken the sky background, making the faint, outer regions of the Orion Nebula (M42) more visible against the sky. It passes the critical Hydrogen-alpha and Oxygen-III wavelengths that the nebula emits, which increases the contrast and color saturation of the nebula itself while suppressing the orange glow from city lights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have an unmodified Canon DSLR. Is the Svbony CLS EOS-C filter a good choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the EOS-C clip-in version is specifically designed for this purpose. An unmodified DSLR has a stock filter that blocks much of the red Hydrogen-alpha light. The Svbony CLS filter helps by increasing the contrast of all other nebula emission lines that your camera *can* see, making it a highly effective upgrade for imaging emission nebulae without modifying your 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 this Svbony CLS filter and a UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main difference is the width of the bandpass. The \u003cstrong\u003eSvbony CLS filter\u003c\/strong\u003e is a broadband filter, allowing a wider range of light through, which results in more natural star colors and better views of broadband targets like galaxies. A \u003cstrong\u003eUHC (Ultra High Contrast) filter\u003c\/strong\u003e has a much narrower bandpass, offering higher contrast on specific emission nebulae but at the cost of less natural colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony CLS filter help with imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, to an extent. Galaxies like Andromeda (M31) are broadband targets, meaning they emit light across the entire visible spectrum. The Svbony CLS filter helps by reducing the overall skyglow, which can improve contrast. However, because it also blocks parts of the galaxy's own light, the effect is less dramatic than on an emission nebula. It is still a major improvement over using no filter from a light-polluted location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Svbony CLS filter change the color of stars in my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, any light pollution filter will introduce a color cast. The Svbony CLS filter produces a milder, typically blue-green cast compared to narrower filters. This is easily corrected during image processing with a proper white balance adjustment to restore natural star colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean my Svbony CLS filter without damaging the coatings?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, use a rocket air blower to remove any loose dust or particles. If smudges remain, apply a few drops of a dedicated lens cleaning solution to a fresh, lint-free microfiber cloth or optical wipe. Gently wipe the filter in a circular motion from the center outwards. Never apply cleaning fluid directly to the filter itself.\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\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\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":52861235167517,"sku":"SV-F9155A","price":31.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235200285,"sku":"SV-F9155B","price":53.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C Clip-In","offer_id":52861235233053,"sku":"SV-F9155D","price":74.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-CLS-Filter-1-25-2-EOS-C-Light-Pollution-Telescope-Photography-1_16a7895a-4a91-4dd8-87d0-9378345d7518.jpg?v=1788660078"},{"product_id":"svbony-linear-polarizer-filter","title":"SVBONY Linear Polarizer Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces light transmission to a comfortable 13% for lunar viewing\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch barrel size fits most eyepieces and accessories\u003c\/li\u003e\n\u003cli\u003eThreads into any accessory with standard M28.5 x 0.6 filter threads\u003c\/li\u003e\n\u003cli\u003eNeutral-colored optical glass provides true-to-life color fidelity\u003c\/li\u003e\n\u003cli\u003eEnhances contrast on bright planets and the Moon for visual and photographic 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\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\u003eSvbony Linear Polarizer Filter 1.25\"\u003c\/h2\u003e\n      \u003cp\u003eThe Svbony 1.25-inch Linear Polarizer Filter is engineered to dramatically reduce the Moon's overwhelming glare by limiting light transmission to a comfortable 13%. This single filter threads directly into any standard M28.5 x 0.6 eyepiece or accessory, making it an essential tool for revealing fine lunar and planetary detail without straining your eyes.\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\u003eReduce Lunar Glare to a Comfortable 13%\u003c\/h3\u003e\n      \u003cp\u003eA full or gibbous Moon viewed through a telescope can be uncomfortably bright, overwhelming your eye and washing out subtle details. This filter transmits just 13% of the incoming light, dimming the view to a perfect level for extended observation. By reducing eye strain, you can spend more time studying crater walls, rilles, and maria without losing your dark adaptation.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExtended Viewing Comfort:\u003c\/strong\u003e The 13% transmission makes long observing sessions possible without discomfort or after-images.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTrue Color Rendition:\u003c\/strong\u003e Made with neutral-colored optical glass, the filter reduces brightness without altering the Moon's natural grey and brown tones.\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\u003eUniversal Fit: Standard 1.25-inch M28.5 Threads\u003c\/h3\u003e\n      \u003cp\u003eDesigned for maximum compatibility, the Svbony filter features standard M28.5 x 0.6 threads in a 1.25-inch housing. This ensures it will connect securely to the vast majority of 1.25-inch eyepieces, diagonals, and camera nosepieces on the market. By cutting through glare, the filter boosts contrast, making it easier to see subtle details on the Moon and separate cloud bands on bright planets like Jupiter, both visually and for photography.\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 purpose of the Svbony 1.25\" Linear Polarizer Filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts primary purpose is to reduce the intense brightness of the Moon, making it more comfortable to observe through a telescope. It transmits only \u003cstrong\u003e13% of the light\u003c\/strong\u003e, which reduces glare and eye strain, and improves the contrast of surface features.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a 13% transmission level good for observing the Moon with the Svbony filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 13% transmission level is a carefully chosen balance. It's dark enough to cut the painful glare of a near-full Moon in most telescopes, but bright enough to still see fine details clearly. This allows for comfortable, long-duration study of the lunar surface.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony Linear Polarizer Filter for objects other than the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it is also effective for reducing glare from other bright objects like Venus and Jupiter, helping to reveal subtle cloud details. However, it is a trade-off; because it blocks so much light, it is not suitable for viewing faint deep-sky objects like nebulae or galaxies, which would be rendered invisible.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Svbony filter fit my eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIf you have standard \u003cstrong\u003e1.25-inch eyepieces\u003c\/strong\u003e, then yes. The Svbony filter has standard \u003cstrong\u003eM28.5 x 0.6\u003c\/strong\u003e threads, which is the industry standard for 1.25-inch astronomical filters and eyepieces.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this Svbony filter help when imaging Jupiter with my 8\" SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIn an 8\" SCT, Jupiter is extremely bright, which can lead to overexposed images and loss of detail. The Svbony 13% filter acts like sunglasses for your camera, reducing the planet's brightness to a more manageable level. This allows you to use longer exposures to reduce atmospheric seeing effects without blowing out the highlights on the planet's cloud bands.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony 1.25\" filter change the color of the Moon or planets?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The filter is made from \u003cstrong\u003eneutral-colored optical glass\u003c\/strong\u003e. It is designed to reduce the brightness across the entire visual spectrum evenly, so you see a dimmer but true-color view without any artificial color cast.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen observing the lunar terminator with my 100mm refractor, is the Svbony 13% filter still useful?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile the terminator (the line between light and shadow) is less bright than the full disk, a 13% filter can still be very helpful. It enhances contrast by darkening the sky background and reducing scattered light within the telescope, making the shadows along the terminator appear deeper and more defined. This can make low-relief features pop.\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\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003e13%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5 x 0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eNeutral-Colored Optical Glass\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\"\u003eSvbony 1.25\" Linear Polarizer 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\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":52861235429661,"sku":"SV-F9165A","price":22.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235462429,"sku":"SV-F9165B","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Linear-Polarizer-Filters-1_5c6dd808-ea4a-406f-b5e1-0335afad20cf.jpg?v=1788660087"},{"product_id":"svbony-sv115-18nm-oiii-narrowband-filter","title":"SVBONY SV115 18nm OIII Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch diameter filter for standard eyepieces and accessories\u003c\/li\u003e\n\u003cli\u003e18nm bandpass isolates key Oxygen-III emission lines\u003c\/li\u003e\n\u003cli\u003e90% peak transmittance at 495.9nm and 500.7nm\u003c\/li\u003e\n\u003cli\u003eBlocks unwanted light pollution from 400-700nm\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\u003eSVBONY SV115 OIII Filter 2 inch 18nm\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV115 OIII Filter isolates nebula emissions by using an 18nm bandpass centered on the critical 495.9nm and 500.7nm Oxygen-III wavelengths. This 2-inch filter achieves 90% peak transmittance for these lines while blocking the surrounding light pollution spectrum from 400-700nm, dramatically increasing contrast for visual observation and imaging.\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\u003eIsolating Nebulae: The 18nm Oxygen-III Window\u003c\/h3\u003e\n\u003cp\u003eThis filter is engineered to pass only the light from doubly ionized oxygen, the signature emission of planetary and most emission nebulae. By rejecting nearly all other visible light across the 400-700nm spectrum, the SV115 darkens the sky background, making faint structures in objects like the Veil Nebula (NGC 6960) or the Dumbbell Nebula (M27) pop into view. The 18nm Full-Width at Half-Maximum (FWHM) is wide enough for bright visual views while still providing a significant contrast boost over broader UHC-style filters.\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\u003e90% Peak Transmittance for Brighter Details\u003c\/h3\u003e\n\u003cp\u003eHigh light transmission is critical, especially for a filter designed to reject most of the spectrum. The SV115's optical coatings deliver a 90% peak transmittance at the key 495.9nm and 500.7nm OIII lines, ensuring the targeted nebula signal reaches your eye or camera sensor with minimal loss. This efficiency means nebulae appear brighter and more detailed, which is particularly beneficial when observing from light-polluted locations or when using smaller aperture telescopes.\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\u003eSV115 18nm OIII vs. Narrower Filters: The Visual Advantage\u003c\/h3\u003e\n\u003cp\u003eCompared to scientific-grade 7nm or 3nm OIII filters, the SV115's 18nm bandpass represents a deliberate trade-off optimized for visual use and versatile imaging. While narrower filters produce even higher contrast, they often dim the view and surrounding stars excessively, sometimes making it difficult to locate targets.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrighter Image:\u003c\/strong\u003e The 18nm window allows more photons through, resulting in a brighter, more engaging visual experience, especially in mid-size telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Natural Star Fields:\u003c\/strong\u003e By not being excessively restrictive, the SV115 retains more starlight, providing a more context-rich view of the nebula within its stellar neighborhood.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLess Sensitive to Off-Band Stars:\u003c\/strong\u003e The slightly wider bandpass is more forgiving for imaging systems, reducing the appearance of halos around very bright, off-band stars.\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 types of celestial objects will the SVBONY SV115 18nm OIII filter improve most?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV115 OIII filter is specifically designed for \u003cstrong\u003eemission nebulae\u003c\/strong\u003e that are rich in doubly ionized oxygen. It provides the most dramatic improvement on planetary nebulae like the Ring Nebula (M57) and the Dumbbell Nebula (M27), as well as supernova remnants like the Veil Nebula (NGC 6960).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV115 18nm OIII filter perform on the Orion Nebula (M42) from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a light-polluted site, the SV115 will be highly effective on the Orion Nebula (M42). It will darken the washed-out city sky, significantly boosting the contrast of the nebula's core and revealing the faint, wing-like structures that are normally invisible. The \u003cstrong\u003e18nm bandpass\u003c\/strong\u003e is an excellent compromise, cutting through skyglow while keeping the view bright enough to enjoy visually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs an 18nm OIII filter like the SV115 good for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SV115 is a capable filter for color camera astrophotography. While dedicated imagers often use narrower filters (e.g., 7nm), the \u003cstrong\u003e18nm bandpass\u003c\/strong\u003e is a great starting point for one-shot-color cameras, as it isolates the OIII signal effectively without being so restrictive that it requires extremely long sub-exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose an 18nm OIII filter over a narrower 7nm or 3nm version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003e18nm bandpass\u003c\/strong\u003e is generally better for visual astronomy. Narrower filters can dim the view too much, making faint objects difficult to see at all. The 18nm width provides a strong contrast enhancement while maintaining a brighter image and showing more stars in the field of view, which helps with orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV115 2-inch OIII filter work with my 8-inch f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 8-inch SCT is an excellent instrument for this filter. The 2-inch format allows you to use it with low-power, wide-field 2-inch eyepieces to frame large targets like the Veil Nebula (NGC 6960). The filter will dramatically increase contrast on these objects, which can be challenging in an SCT from suburban skies without filtration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the SVBONY SV115 OIII filter brighten nebulae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo filter can make an object brighter than it is without a filter in perfectly dark skies. Instead, the SV115 works by \u003cstrong\u003eselectively dimming the background skyglow\u003c\/strong\u003e far more than it dims the nebula. This process dramatically increases the contrast between the nebula and the sky, making the nebula much easier to see.\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\u003eNarrowband OIII (Oxygen-III)\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\u003eCentral Wavelengths\u003c\/td\u003e\n\u003ctd\u003e495.9nm and 500.7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM (Bandpass)\u003c\/td\u003e\n\u003ctd\u003e18nm (±2nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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\"\u003eSV115 OIII Filter 2 inch 18nm\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\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\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":52861235527965,"sku":"SV-F9186A","price":64.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235560733,"sku":"SV-F9186B","price":78.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV115-OIII-Filter-2-inch-18nm-Reducing-Light-Polution-1_4a007e91-244a-45a6-8067-b680fa8db4dc.jpg?v=1788660107"},{"product_id":"svbony-sv132-25nm-h-beta-narrowband-filter","title":"SVBONY SV132 25nm H-Beta Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTargets the 486nm Hydrogen-Beta emission line\u003c\/li\u003e\n\u003cli\u003e25nm bandpass for enhanced contrast\u003c\/li\u003e\n\u003cli\u003e80% peak transmittance at the H-Beta wavelength\u003c\/li\u003e\n\u003cli\u003eBlocks Mercury (Hg) and Sodium (Na) light pollution to 0.1%\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch barrel with M28.5*0.6 threads\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 SV132 H-Beta Filter 25nm 1.25inch\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV132 H-Beta Filter isolates a specific 25nm window around the 486nm H-Beta emission line, a critical tool for observing nebulae that are otherwise invisible. With 80% transmittance at its target wavelength and aggressive 0.1% blocking of common Mercury (Hg) and Sodium (Na) streetlight emissions, this 1.25-inch filter dramatically increases the contrast of famously difficult objects like the Horsehead Nebula (B33) and the California Nebula (NGC 1499).\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 25nm Bandpass for Elusive Nebulae\u003c\/h3\u003e\n\u003cp\u003eCertain nebulae emit almost exclusively in the blue-green light of Hydrogen-Beta at 486nm. The SV132's 25nm FWHM (Full Width at Half Maximum) is engineered specifically for these targets. This bandpass is narrow enough to reject city glow and natural skyglow, yet wide enough to deliver a bright image in moderate to large-aperture telescopes under dark skies.\u003c\/p\u003e\n\u003cp\u003eWithout an H-Beta filter, objects like the Cocoon Nebula (IC 5146) are often completely lost against the background sky. By transmitting 80% of the nebula's specific light while dimming the surrounding stars and sky, the SV132 makes these challenging deep-sky targets achievable from your backyard.\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\/4 Wave Optics and 0.1% Light Pollution Blocking\u003c\/h3\u003e\n\u003cp\u003eThe SV132 is built on a double-side polished optical glass substrate with a surface accuracy of 1\/4 wave, ensuring it does not degrade the sharpness or clarity of your telescope's optics. Advanced coatings reject light pollution from Mercury (Hg) vapor lamps at 435nm and 578nm, and Sodium (Na) vapor lamps at 589nm, with just 0.1% transmission.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHomogeneous Coatings:\u003c\/strong\u003e A planetary rotation system during the coating process ensures uniformity across the entire filter surface, preventing hotspots or variations in the passband.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Views:\u003c\/strong\u003e By precisely blocking out the 400-700nm continuum spectrum outside the H-Beta line, the filter renders a darker sky background, making the faint structure within nebulae pop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimized Halos:\u003c\/strong\u003e The combination of a quality 1.85mm thick substrate and precise coatings eliminates distracting halos around bright stars.\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 Specialist's Filter: When to Use the SV132 H-Beta\u003c\/h3\u003e\n\u003cp\u003eIt's critical to understand that the H-Beta filter is a specialized instrument, not a general-purpose \"nebula filter.\" While it is essential for H-Beta dominant objects, it will significantly dim or completely block the light from most other nebulae, galaxies, and star clusters which are brighter in other wavelengths like Oxygen-III or Hydrogen-Alpha.\u003c\/p\u003e\n\u003cp\u003eThe SV132's metal cell features standard M28.5*0.6 threads, making it compatible with any standard 1.25-inch eyepiece or accessory. For observers with 8-inch or larger telescopes seeking to hunt down the most elusive objects on their list, this filter is an indispensable tool.\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 specific objects is the SVBONY SV132 H-Beta filter for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV132 H-Beta filter is designed for a select group of emission nebulae that are almost invisible without it. Its primary targets are the \u003cstrong\u003eHorsehead Nebula (Barnard 33)\u003c\/strong\u003e, the \u003cstrong\u003eCalifornia Nebula (NGC 1499)\u003c\/strong\u003e, and the \u003cstrong\u003eCocoon Nebula (IC 5146)\u003c\/strong\u003e. It can also help with parts of the Lambda Orionis cluster (Collinder 69).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV132 H-Beta filter make the Orion Nebula (M42) look better?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it will make the Orion Nebula (M42) look significantly worse. M42 is extremely bright in Oxygen-III and Hydrogen-Alpha wavelengths, which the SV132 is designed to block. For targets like M42, M8 (the Lagoon Nebula), or M27 (the Dumbbell Nebula), a UHC or OIII filter is the correct choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the SV132 H-Beta different from a UHC or OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThey target completely different wavelengths. The SV132 passes light at \u003cstrong\u003e486nm (H-Beta)\u003c\/strong\u003e. An OIII filter passes light around \u003cstrong\u003e500nm (Oxygen-III)\u003c\/strong\u003e, which is best for planetary nebulae. A UHC (Ultra High Contrast) filter has two passbands, one for H-Beta and one for OIII, making it a more general-purpose filter for most emission nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat telescope is best for the SVBONY SV132 25nm H-Beta filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter works best with moderate to large aperture telescopes, typically \u003cstrong\u003e8 inches (200mm) or larger\u003c\/strong\u003e. Because the target nebulae are inherently very faint, a larger aperture is needed to collect enough light for a satisfying view. It is most effective under dark skies, as severe light pollution can overwhelm even a narrowband filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the SVBONY SV132 have a 25nm bandpass?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e25nm bandpass (FWHM)\u003c\/strong\u003e is a balance between contrast and brightness. It is narrow enough to effectively block out most forms of light pollution and natural skyglow, which increases contrast. However, it's not so narrow that it makes the image too dim in amateur-sized telescopes, which can happen with ultra-narrow imaging filters.\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\" SV132 H-Beta filter for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for visual use, it can be used for imaging with a color camera to enhance the H-Beta signal in certain targets. However, dedicated astrophotography filters typically have a much narrower bandpass (e.g., 3nm to 7nm) for maximum contrast and are often threaded for filter wheels or camera noses rather than eyepieces.\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\u003eThread Size\u003c\/td\u003e\n\u003ctd\u003eM28.5*0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (FWHM)\u003c\/td\u003e\n\u003ctd\u003e25±3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength\u003c\/td\u003e\n\u003ctd\u003e486nm (Hydrogen-Beta)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e80% at 486nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury (Hg) Line Transmission\u003c\/td\u003e\n\u003ctd\u003e0.1% at 435nm \u0026amp; 578nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSodium (Na) Line Transmission\u003c\/td\u003e\n\u003ctd\u003e0.1% at 589nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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\"\u003eSV132 1.25\" H-Beta 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 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861235659037,"sku":"SV-W9102A","price":66.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235691805,"sku":"SV-W9102B","price":73.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV132-H-Beta-Filter-25nm-1-25inch-Light-Pollution-Filter-1_63fda3de-6ff9-4a65-9f77-87ce7c5656e7.jpg?v=1788660123"},{"product_id":"svbony-sv139-nd0-6-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces lunar glare with a fixed ND0.6 optical density\u003c\/li\u003e\n\u003cli\u003eTransmits a neutral 25% of incoming light\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch barrel fits most eyepieces\u003c\/li\u003e\n\u003cli\u003eMulti-coated optical glass for maximum contrast\u003c\/li\u003e\n\u003cli\u003eDurable anodized aluminum filter 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 SV139 1.25-inch ND0.6 Neutral Density Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV139 ND0.6 filter is a fixed-transmission neutral density filter for any standard 1.25-inch eyepiece, designed to reduce overwhelming lunar brightness to comfortable levels. By transmitting a neutral 25% of incoming light, the ND0.6 filter reveals subtle surface details on the Moon, from fine rilles to complex crater walls, without altering its natural 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\u003eTaming Lunar Glare: The ND0.6 (25% Transmission) Advantage\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon, especially near its full phase, can be uncomfortably bright through a telescope, causing your pupil to contract and washing out fine detail. The SV139 ND0.6 filter cuts this glare by 75%, allowing your eye to relax and perceive significantly more surface contrast. This fixed 25% transmission is an ideal all-purpose reduction for viewing different lunar phases in a wide range of telescope apertures.\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\" Anodized Aluminum Cell with Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eThe SV139 filter is built into a durable, black-anodized aluminum cell that threads directly onto any standard 1.25-inch eyepiece or accessory. The optical glass is fully multi-coated to suppress internal reflections and ghosting, ensuring that the only thing you see is a sharp, high-contrast image of your target. This construction prevents the filter itself from degrading the view it's meant to improve.\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\u003eSV139 ND0.6 vs. Variable Polarizing Filters: Simplicity and Throughput\u003c\/h3\u003e\n\u003cp\u003eA variable polarizing filter offers adjustable brightness, which can be useful for different targets. However, the SVBONY SV139 ND0.6 filter's single-element design provides higher light throughput and fewer internal surfaces for reflections compared to a stacked polarizer. Its simplicity means there's no need to dial in the correct setting—it delivers a consistent 25% transmission for reliable, high-contrast lunar views every time.\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 SVBONY SV139 ND0.6 filter perform on the full Moon in an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's an excellent match. An 8\" Schmidt-Cassegrain gathers significant light, making the full Moon uncomfortably bright. The \u003cstrong\u003eND0.6\u003c\/strong\u003e filter reduces the glare to a comfortable \u003cstrong\u003e25%\u003c\/strong\u003e, allowing you to see sharp detail along the terminator and within bright ray systems like those of Copernicus and Tycho without dazzling your eye.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV139 filter to see more detail on Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, particularly in larger telescopes. While primarily a lunar filter, the SV139 can reduce the intense brightness of planets like Jupiter and Venus, which can help in discerning subtle features. In an 8\" or larger telescope, cutting the glare can make it easier to pick out faint cloud bands or the Great Red Spot on Jupiter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"ND0.6\" mean for the SVBONY SV139 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eND0.6\u003c\/strong\u003e refers to an optical density of 0.6. This means the filter transmits 10\u003csup\u003e-0.6\u003c\/sup\u003e, or \u003cstrong\u003e25%\u003c\/strong\u003e, of the light that passes through it. It's a logarithmic scale where ND0.3 is 50% transmission, ND0.6 is 25%, and ND0.9 is 12.5%. The ND0.6 is considered a great medium-level filter for general lunar work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV139 filter change the color of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. As a \u003cstrong\u003eneutral density\u003c\/strong\u003e filter, the SV139 is engineered to reduce brightness equally across the entire visible spectrum. Unlike color filters (e.g., yellow or blue), it will not impart any tint, preserving the Moon's true grey and white coloration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the SVBONY SV139 filter to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter has standard \u003cstrong\u003e1.25-inch filter threads (M28.5x0.6)\u003c\/strong\u003e. You simply screw it into the threaded barrel of any standard 1.25-inch eyepiece. It can also be attached to other 1.25-inch accessories like diagonals or Barlow lenses that accept filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV139 ND0.6 a good choice for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for lunar and bright planetary imaging. It helps prevent the camera sensor from being overexposed by the bright lunar surface or planets. This allows you to use longer exposure times to capture fainter details or lower the camera's gain for reduced noise in your final 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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Density\u003c\/td\u003e\n\u003ctd\u003eND0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 in\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\"\u003eSV139 1.25\" ND0.6 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\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":52861235986717,"sku":"SV-W9108A","price":13.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV139-Telescope-Filter-1-25inch-ND-Neutral-Density-For-Moon-Viewing-1_f7341da8-b200-4c68-9ed6-96d125fb3a9f.jpg?v=1788660179"},{"product_id":"svbony-sv139-nd0-9-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND0.9 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces lunar brightness by ~87.5% (ND0.9)\u003c\/li\u003e\n\u003cli\u003eFits any standard 1.25-inch eyepiece or accessory\u003c\/li\u003e\n\u003cli\u003eNeutral density filter preserves true color balance\u003c\/li\u003e\n\u003cli\u003eFully multi-coated optics prevent glare and reflections\u003c\/li\u003e\n\u003cli\u003eDurable black-anodized aluminum filter 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\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 SV139 1.25-inch ND0.9 Neutral Density Filter\u003c\/h2\u003e\n      \u003cp\u003eThe SVBONY SV139 Telescope Filter provides a specific ND0.9 density, designed to fit any standard 1.25-inch eyepiece. This level of filtration reduces the overwhelming brightness of the Moon by approximately 87.5% (transmitting 12.5% of light), allowing your eye to perceive subtle rilles, crater walls, and ejecta blankets that are normally lost to glare.\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\u003eND0.9 Brightness Reduction: Comfortable Lunar Viewing\u003c\/h3\u003e\n      \u003cp\u003eObserving the Moon, especially from the first quarter to full, can be uncomfortably bright through a telescope, causing your pupil to contract and washing out fine detail. The SV139 filter's ND0.9 rating darkens the view to a comfortable level without altering its natural color. This significant 87.5% reduction in brightness (an 8× reduction) is ideal for revealing low-contrast features across lunar maria and highlands.\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\u003eMulti-Coated Optics in a 1.25\" Cell: Preserving Contrast\u003c\/h3\u003e\n      \u003cp\u003eWhile designed to reduce light, this filter uses fully multi-coated optical glass to ensure that the light you do see is pristine. These coatings prevent internal reflections between the eyepiece and the filter, which could otherwise reduce contrast and introduce ghosting. The filter is housed in a durable, threaded 1.25-inch aluminum cell for a secure fit on any standard eyepiece or filter wheel.\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 does ND0.9 mean for the SVBONY SV139 filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eND0.9\u003c\/strong\u003e is a measure of optical density. It means the filter allows approximately 12.5% of the light to pass through it, effectively blocking 87.5% of the incoming light (a 3-stop or 8× reduction). This is a strong level of filtration, ideal for reducing glare from a bright or full Moon for visual observation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV139 ND filter for observing planets like Jupiter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, in larger aperture telescopes (typically 8\" or more), planets like Jupiter and Venus can be bright enough to cause glare that obscures fine detail. The SVBONY SV139 ND0.9 filter helps cut this glare effectively, improving contrast on Jupiter's cloud bands or subtle features on Venus without affecting the planet's natural color.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SV139 ND filter affect the color of the Moon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt doesn't. The \"ND\" in the SVBONY SV139 stands for \u003cstrong\u003eNeutral Density\u003c\/strong\u003e, which means it reduces the intensity of all wavelengths of light equally. This darkens the image without introducing any color cast, so the Moon retains its natural grey and subtle brown tones.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV139 1.25\" ND filter work with my 8\" Dobsonian telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. The SVBONY SV139 filter has standard 1.25-inch filter threads (M28.5x0.6), which will screw directly into the barrel of any standard 1.25-inch eyepiece you would use with your 8\" Dobsonian. The ND0.9 density is an excellent choice for an 8\" scope, as it provides strong glare reduction for lunar viewing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the SVBONY SV139 ND0.9 filter instead of a weaker or stronger one?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe ND0.9 provides an 87.5% light reduction (12.5% transmission), making it ideal for medium-to-large telescopes viewing the Moon near its full phase. An ND0.6 (25% transmission) is better for smaller scopes or early moon phases, while an ND1.2 or ND3.0 provides extreme light reduction for very large apertures.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack the SVBONY SV139 filter with other 1.25\" filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The SVBONY SV139 filter cell is threaded on both sides. You can stack it with a color filter (like a #80A Blue to enhance contrast on Jupiter) or even another ND filter to create a stronger dimming effect. However, stacking filters can sometimes introduce reflections, so it's best to use the minimum number of filters necessary.\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\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\u003eSV139\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNeutral Density (ND)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Density\u003c\/td\u003e\n\u003ctd\u003eND0.9\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight Transmission\u003c\/td\u003e\n\u003ctd\u003e~12.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 in\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\"\u003eSVBONY SV139 1.25-inch ND0.9 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\"\u003ePlastic Storage 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":52861236019485,"sku":"SV-W9108B","price":13.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV139-Telescope-Filter-1-25inch-ND-Neutral-Density-For-Moon-Viewing-1-W9108B_29210557-1fc0-4351-b54b-60152cf50f46.jpg?v=1788660188"},{"product_id":"svbony-sv139-nd1-2-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces Lunar Glare with ND1.2 Density\u003c\/li\u003e\n\u003cli\u003eTransmits 6.25% of Incoming Light\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch Barrel Threads\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated Optical Glass\u003c\/li\u003e\n\u003cli\u003eNeutral Color Rendition\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 SV139 1.25-inch ND1.2 Neutral Density Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV139 1.25-inch ND1.2 filter is engineered to transmit just 6.25% of incoming light, cutting the overwhelming glare from the Moon to reveal fine surface detail. By screwing this filter into any standard 1.25-inch eyepiece, you reduce brightness by a factor of sixteen (a 4-stop reduction), making extended observations comfortable and bringing subtle rilles, crater walls, and ejecta blankets into sharp relief without altering the Moon's natural color.\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\u003eND1.2 Density: 6.25% Transmission for Comfortable Lunar Viewing\u003c\/h3\u003e\n\u003cp\u003eObserving the Moon, especially near its full phase, can be uncomfortably bright through a telescope, causing temporary dazzle and washing out delicate contrast. The SV139 filter's fixed ND1.2 density provides a 93.75% reduction in brightness, allowing your eye to relax and perceive the subtle tonal variations across lunar maria and highlands. This level of attenuation is ideal for most small-to-medium aperture telescopes, revealing details that are otherwise lost in the 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\u003eOptical Fidelity in a Standard 1.25-inch Cell\u003c\/h3\u003e\n\u003cp\u003eA filter is useless if it degrades the image. The SV139 uses fully multi-coated optical glass to maximize contrast and prevent internal reflections, ensuring the view remains crisp and clear. The precisely machined aluminum cell features standard 1.25-inch filter threads, guaranteeing compatibility with virtually any 1.25-inch eyepiece or accessory, allowing for quick and secure attachment for both visual observation and astrophotography.\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 \"ND1.2\" mean for the SVBONY SV139 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eND1.2\u003c\/strong\u003e signifies a Neutral Density filter that allows \u003cstrong\u003e6.25% of light to pass through\u003c\/strong\u003e it (a transmission factor of 10^-1.2). This is equivalent to a 4-stop reduction in exposure for photography and provides a significant, comfortable dimming effect for visual observation of bright objects like the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV139 filter change the color of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. As a \u003cstrong\u003eneutral\u003c\/strong\u003e density filter, the SV139 is designed to reduce brightness evenly across the entire visible spectrum. It dims the view without introducing any color cast, preserving the natural grey and brown tones of the lunar surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the SV139 1.25-inch filter to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter has standard threads on its cell that screw directly into the barrel of any \u003cstrong\u003e1.25-inch eyepiece\u003c\/strong\u003e. You simply thread it onto the bottom of your chosen eyepiece before inserting the eyepiece into the telescope's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV139 ND1.2 filter dark enough for viewing the full Moon in a 10\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for most observers, an ND1.2 filter is an excellent choice for a 10\" telescope, providing a major reduction in glare. However, due to the large light-gathering power of the telescope, some observers may prefer an even darker filter (like an ND3.0, 0.1% transmission) or a variable polarizing filter for maximum comfort during the brightest phases of the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV139 filter to view the crescent phase of Venus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Venus is another extremely bright target where glare can hide its delicate crescent shape. The SV139 ND1.2 filter is very effective at reducing the planet's brightness, making its phase much easier to see clearly. It can also be useful for splitting bright double stars where one component overwhelms the other.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV139 ND filter for deep-sky objects like nebulae or galaxies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not intended for faint deep-sky objects. It is designed to reduce light, which would make faint objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31) completely invisible. For those targets, you need light pollution or narrowband filters that selectively pass light, rather than block it.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNeutral Density (ND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDensity\u003c\/td\u003e\n\u003ctd\u003eND1.2 (6.25% Transmission)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 in\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\"\u003eSV139 1.25-inch ND1.2 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\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":52861236052253,"sku":"SV-W9108C","price":12.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV139-Telescope-Filter-1-25inch-ND-Neutral-Density-For-Moon-Viewing-1-W9108C_03856145-2a09-4478-ba89-fdd05882474c.jpg?v=1788660197"},{"product_id":"svbony-sv139-nd3-0-neutral-density-moon-filter-125in","title":"SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eND3.0 Neutral Density Filter\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch Barrel Size\u003c\/li\u003e\n\u003cli\u003eTransmits 0.1% of Incoming Light (10-Stop \/ 1000× Reduction)\u003c\/li\u003e\n\u003cli\u003eIdeal for Herschel Solar Wedges \u0026amp; Solar Imaging Accessories\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated Optical Glass in Black 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 SV139 1.25-inch ND3.0 Neutral Density Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV139 1.25-inch ND3.0 Neutral Density filter provides an intense 0.1% light transmission (a 10-stop or 1000× reduction) without altering natural color rendition. This specialized filter threads directly into standard 1.25-inch eyepieces and accessories, serving as an essential light attenuation tool primarily used alongside Herschel solar wedges, dedicated solar setups, and specialized solar imaging rigs.\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\u003eND3.0 Transmission: Safe Light Reduction for Solar Wedges \u0026amp; Imaging\u003c\/h3\u003e\n\u003cp\u003eBecause an ND3.0 filter cuts 99.9% of incoming light, it is far too dark for nighttime lunar or planetary observation. Instead, its core application is downstream solar light control. When paired with a Herschel solar wedge (which reflects 95–96% of sunlight away), the SV139 ND3.0 filter safely steps down the remaining intense beam to a comfortable level for white-light solar viewing of sunspots, granulation, and solar faculae.\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\u003eMulti-Coated Optical Glass in a Standard 1.25\" Cell\u003c\/h3\u003e\n\u003cp\u003eConstructed with high-quality fully multi-coated optical glass, the SV139 minimizes internal reflections and maintains crisp image contrast. The standard 1.25-inch cell features double-sided threads (M28.5 x 0.6mm), allowing you to easily stack it with a Polarizing filter or a solar continuum filter for further light fine-tuning.\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 use for an ND3.0 filter in astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003eND3.0 filter\u003c\/strong\u003e reduces light intensity by 99.9% (transmitting just 0.1%, or a 10-stop reduction). Because it is so dark, it is primarily used in solar observation downstream of a Herschel solar wedge to bring the remaining light down to safe, comfortable visual or photographic levels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I look at the Sun using ONLY this ND3.0 filter on my eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNO. NEVER use an ND3.0 filter alone at the eyepiece for solar viewing.\u003c\/strong\u003e Unfiltered sunlight focused by a telescope aperture will instantly shatter or melt an eyepiece filter and cause permanent blindness. An ND3.0 filter must only be used \u003cem\u003ebehind\u003c\/em\u003e a proper front-aperture solar filter or inside a dedicated Herschel solar wedge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY ND3.0 filter for nighttime viewing of the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, an ND3.0 filter is generally far too dark for nighttime lunar observing. Cutting 99.9% of the light will render the lunar surface dim and difficult to perceive. For visual lunar observing, lighter filters like ND0.6 (25% transmission), ND0.9 (12.5% transmission), or ND1.2 (6.25% transmission) are recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the ND3.0 filter used with a Herschel Solar Wedge?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Herschel wedge dumps ~95% of incoming solar energy out of its heat trap, but the remaining 5% light beam is still too bright for direct human eyes. Threading the ND3.0 filter into the wedge's eyepiece barrel reduces that remaining light by 99.9%, bringing the final view into a safe, comfortable intensity range for white-light solar observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack the SVBONY SV139 ND3.0 with other filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SV139 aluminum cell features threads on both sides. In solar setups, observers frequently stack an ND3.0 filter with a Variable Polarizer (to fine-tune brightness) or a Solar Continuum filter (to highlight sunspot details and contrast).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the SVBONY SV139 filter to my setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter features standard 1.25-inch threads (M28.5 x 0.6mm). It simply threads onto the bottom barrel of any standard 1.25-inch eyepiece, camera nosepiece, or Herschel wedge accessory adapter.\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\u003eSV139\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNeutral Density (ND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Density\u003c\/td\u003e\n\u003ctd\u003eND3.0 (0.1% Transmission \/ 10-Stop)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 in (M28.5 x 0.6 Thread)\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 SV139 1.25\" ND3.0 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\"\u003ePlastic Storage 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\/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":52861236085021,"sku":"SV-W9108D","price":13.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV139-Telescope-Filter-1-25inch-ND-Neutral-Density-For-Moon-Viewing-1-W9108D_f30713f0-55c3-4128-9cfc-0ce4e0594c16.jpg?v=1788660207"},{"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":"svbony-sv227-sho-5nm-h-alpha-oiii-sii-narrowband-filter-set-125in","title":"SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eComplete 1.25-inch SHO (SII, H-Alpha, OIII) filter set\u003c\/li\u003e\n\u003cli\u003eTight 5nm bandpass for high-contrast imaging\u003c\/li\u003e\n\u003cli\u003ePeak transmission rate of ≥90% at key wavelengths\u003c\/li\u003e\n\u003cli\u003eOD5 blocking of light from 300-1000nm\u003c\/li\u003e\n\u003cli\u003e1\/4λ surface parallelism for sharp stars\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 SV227 1.25\" SHO 5nm Narrowband Filter Set\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV227 1.25\" SHO 5nm Narrowband Filter Set delivers the essential tools for creating high-contrast Hubble Palette images of deep-sky emission nebulae. This complete set isolates the critical emission lines of Sulfur-II at 671.6nm, Hydrogen-alpha at 656.3nm, and Oxygen-III at 500.7nm with a tight 5nm bandpass. With a peak transmission of ≥90% and OD5 blocking across the 300-1000nm spectrum, these filters capture faint nebula details while aggressively rejecting light pollution and moonlight.\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\u003eIsolate Key Nebula Emissions with a 5nm Bandwidth\u003c\/h3\u003e\n\u003cp\u003eThe core of narrowband imaging is isolating the specific wavelengths of light emitted by ionized gases in space. The SV227 set provides three filters precisely centered on these lines: 656.3nm for H-alpha, 500.7nm for OIII, and 671.6nm for SII. A narrow 5nm bandpass dramatically increases contrast by rejecting continuum emission from stars and suppressing skyglow, making faint structures within nebulae like the Pillars of Creation in the Eagle Nebula (M16) stand out against a dark background.\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\u003e≥90% Peak Transmission and 1\/4λ Surface Parallelism\u003c\/h3\u003e\n\u003cp\u003eHigh transmission and optical precision are critical for capturing clean data. The SV227 filters ensure that over 90% of the targeted narrowband light reaches your sensor, minimizing exposure times. Each filter is polished to a 1\/4λ surface parallelism, which prevents the introduction of astigmatism or other aberrations, keeping star shapes tight and round across the entire 26mm clear aperture.\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\u003eOD5 Blocking for Imaging Under Light-Polluted Skies\u003c\/h3\u003e\n\u003cp\u003eFor imagers in urban or suburban locations, aggressive blocking of unwanted light is non-negotiable. The SV227 filters provide an optical density (OD) of 5, which blocks out 99.999% of all light outside the 5nm passband, from 300nm to 1000nm. This deep blocking effectively eliminates gradients from streetlights, moonlight, and general skyglow, allowing you to capture clean, high-signal data even under compromised sky conditions.\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\u003e1.85mm Substrate with M28.5x0.6 Threads\u003c\/h3\u003e\n\u003cp\u003eBuilt for reliability, each SV227 filter uses a 1.85mm thick glass substrate housed in a CNC-machined 6061T aluminum alloy cell. The standard M28.5x0.6 male threads ensure compatibility with any 1.25-inch filter wheel or drawer. The consistent 1.85mm thickness across the set helps maintain focus between filter changes, reducing the need for constant refocusing throughout an imaging session.\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\u003eWhy Choose a 5nm Filter Set Over Wider Bandpasses?\u003c\/h3\u003e\n\u003cp\u003eWhile wider filters (like 7nm or 12nm) can allow for slightly shorter sub-exposures, a 5nm bandpass offers a distinct advantage in contrast. The tighter window rejects more of the unwanted light immediately surrounding the emission line, which results in a darker sky background and smaller, more controlled stars. This trade-off makes the 5nm SV227 set an excellent choice for imagers prioritizing maximum detail and contrast, especially from light-polluted locations.\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 advantage of the SVBONY SV227 5nm filter set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its tight \u003cstrong\u003e5nm bandpass\u003c\/strong\u003e. This provides extremely high contrast by isolating the specific H-alpha, OIII, and SII emission lines while rejecting nearly all other light, including light pollution and starlight. This results in a darker sky background and more prominent nebula detail compared to wider filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SVBONY SV227 5nm filters perform on the Orion Nebula (M42) from a light-polluted suburb?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV227 filters are ideal for this scenario. The Orion Nebula (M42) is rich in H-alpha and OIII emissions. The \u003cstrong\u003eOD5 blocking\u003c\/strong\u003e will eliminate the vast majority of your suburban skyglow, and the 5nm bandpass will separate the faint, intricate structures of the nebula from the bright stars of the Trapezium, allowing you to capture far more detail than is possible with broadband or wider narrowband filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV227 SHO set with my color camera and 80mm f\/6 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically possible, this set is designed and optimized for \u003cstrong\u003emonochrome astronomy cameras\u003c\/strong\u003e. Using these filters with a one-shot color (OSC) camera is highly inefficient, as the camera's color filter array will block most of the light that passes through the narrowband filter. For the best results and to create Hubble Palette images, you should pair the SV227 set with a monochrome camera and a filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the SVBONY SV227 filters parfocal with each other?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filters in the SV227 set are manufactured to be nearly parfocal. They all use the same \u003cstrong\u003e1.85mm substrate thickness\u003c\/strong\u003e, which means that any focus shift when switching between the H-alpha, OIII, and SII filters should be minimal. This saves time during an imaging session as you won't need to perform a major refocus after every filter change.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does OD5 blocking mean for the SV227 filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD5\u003c\/strong\u003e stands for Optical Density 5. This is a logarithmic scale meaning the filters block 10^5, or 100,000 times, the amount of unwanted light. In practical terms, it means they transmit only 0.001% of light outside their specified passband across a wide spectrum from 300nm to 1000nm, ensuring exceptional rejection of light pollution and moonlight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the SVBONY SV227 set include three separate storage cases?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAs listed in the box contents, each of the three filters (H-alpha, SII, OIII) comes with its own protective \u003cstrong\u003ePP Storage Case\u003c\/strong\u003e. This prevents the filters from scratching or rubbing against each other during transport or storage and makes it easy to identify and handle them individually without exposing the others to dust or fingerprints.\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\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eSII \u0026amp; OIII \u0026amp; H-Alpha Filter Set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eW9187A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e1.25-Inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth\u003c\/td\u003e\n\u003ctd\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Wavelengths\u003c\/td\u003e\n\u003ctd\u003e671.6nm (SII), 656.3nm (H-Alpha), 500.7nm (OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e≥90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Strength\u003c\/td\u003e\n\u003ctd\u003eOD5 @ 300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-off Depth\u003c\/td\u003e\n\u003ctd\u003eAverage ≥ OD5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e26mm\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\/4λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6 (Single Male Thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e6061T Aluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Finish\u003c\/td\u003e\n\u003ctd\u003eCNC Machined, Black Anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Dimensions\u003c\/td\u003e\n\u003ctd\u003eΦ31.75 x 7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight (per filter)\u003c\/td\u003e\n\u003ctd\u003e15g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight (set)\u003c\/td\u003e\n\u003ctd\u003e140g\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\"\u003e1.25\" H-alpha Filter (5nm)\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\"\u003e1.25\" SII Filter (5nm)\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\"\u003e1.25\" OIII Filter (5nm)\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\"\u003ePP Storage Cases\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 3\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":"Default Title","offer_id":52861237068061,"sku":"SV-W9187A","price":235.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV227-1-25-SHO-5nm-Narrowband-Filter-Set-for-Deep-Sky-1_eea5be8f-ad97-4327-a6bb-e8e103fa63cc.jpg?v=1788883698"},{"product_id":"svbony-sv227-sii-5nm-narrowband-filter-2in","title":"SVBONY SV227 SII 5nm Narrowband Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCaptures Sulfur-II (SII) emission at a 672nm center wavelength\u003c\/li\u003e\n\u003cli\u003eExtremely narrow 5nm bandpass for maximum contrast\u003c\/li\u003e\n\u003cli\u003ePeak light transmission of ≥90% for strong signal\u003c\/li\u003e\n\u003cli\u003eOD5 blocking rejects light pollution and unwanted wavelengths\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch format with M48x0.75 filter threads\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 SV227 2\" SII 5nm Narrowband CCD Filter for Deep Sky\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV227 2\" SII 5nm Narrowband CCD Filter isolates the critical 672nm Sulfur-II emission line with a tight 5nm full width at half maximum (FWHM) for extreme-contrast imaging. With a peak transmittance of ≥90% and deep out-of-band blocking rated at OD5, the SV227 ensures a pure signal from emission nebulae reaches your sensor. The filter is built on a 1.85mm thick substrate with 1\/4λ surface parallelism and fits standard 2-inch filter wheels via its M48x0.75 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\u003eThe 5nm Bandpass: Isolating the 672nm SII Line\u003c\/h3\u003e\n\u003cp\u003eBy restricting the incoming light to a narrow 5nm window centered on the 672nm SII line, the SV227 dramatically increases the contrast of emission nebulae against the skyglow background. This narrow bandpass is significantly more effective at rejecting light pollution from streetlights and moonlight than wider filters, darkening the sky background and allowing faint structural details to emerge during long 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\u003eOptical Precision: ≥90% Transmission with OD5 Blocking\u003c\/h3\u003e\n\u003cp\u003eA narrow filter is only effective if it transmits the light you want while rejecting everything else. The SV227 achieves a high peak transmittance of ≥90% within its passband, ensuring that valuable photons from your target aren't lost. Simultaneously, its OD5 blocking rating attenuates unwanted wavelengths by a factor of 100,000, delivering a clean signal free of IR contamination and reflected halos, which is critical for producing sharp stars and clean nebulosity.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate Quality:\u003c\/strong\u003e The 1.85mm substrate with a 1\/4λ surface parallelism rating ensures that the filter will not introduce distortions into your optical train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClear Aperture:\u003c\/strong\u003e A 44mm clear aperture minimizes the risk of vignetting, even with fast optical systems or large-format 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 SV227 in SHO Imaging: Completing the Hubble Palette\u003c\/h3\u003e\n\u003cp\u003eThe SV227 is the essential \"S\" channel for creating tricolor narrowband images in the popular Hubble Palette (SHO). When combined with H-alpha and OIII filters of a similar 5nm bandpass, it allows you to assign each emission line to a different color channel (SII=Red, Ha=Green, OIII=Blue) to reveal the complex chemical composition of targets like the Pillars of Creation in the Eagle Nebula (M16).\u003c\/p\u003e\n\u003cp\u003eThe shared 5nm bandpass across your filter set ensures that star sizes are consistent between channels, simplifying post-processing and resulting in a more refined final image. The SV227's M48x0.75 thread makes it a direct fit for any standard 2-inch filter wheel or drawer.\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 the SVBONY SV227 SII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV227 is a specialized narrowband filter for astrophotography. It is designed to isolate the \u003cstrong\u003eSulfur-II (SII) emission line at 672nm\u003c\/strong\u003e, which is prominent in many emission nebulae. This allows you to capture high-contrast images of these objects, even from light-polluted locations, and is a critical component for creating \"Hubble Palette\" color images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SV227's 5nm bandpass compare to a 7nm filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003e5nm bandpass\u003c\/strong\u003e is narrower than a 7nm one, offering superior rejection of light pollution and higher contrast on faint nebulae. The trade-off is that it requires slightly longer exposure times to achieve the same signal level. For heavily light-polluted skies or for imagers seeking maximum detail, the 5nm bandpass of the SV227 is the better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV227 work for imaging the Soul Nebula (IC 1848) with my monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The Soul Nebula is rich in glowing ionized gas, including Sulfur-II. Using the SVBONY SV227 with a monochrome camera is the ideal way to capture the faint, intricate structures within this nebula that are often lost in broadband or wider-filter images. It will provide the \"S\" data needed for a full SHO color composite.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 5nm bandpass of the SV227 suitable for my f\/5 Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a 5nm filter like the SV227 is generally fine for systems down to f\/4. In very fast optical systems (f\/4 and faster), narrowband filters can experience a slight shift in their center wavelength. However, at f\/5, the SV227 will perform very well, providing excellent contrast without significant band-shifting issues.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does OD5 blocking mean for my images with the SV227 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD5 (Optical Density 5)\u003c\/strong\u003e means the filter blocks out-of-band light by a factor of 100,000 (10^5). This is a very high level of rejection that ensures only the desired 672nm SII light reaches your sensor. It prevents star bloat from infrared (IR) light and eliminates gradients from nearby light pollution sources, resulting in a cleaner, higher-contrast image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV227 filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not recommended for visual use. The 5nm bandpass is extremely restrictive and will make the view through an eyepiece far too dim to see anything. Narrowband filters like the SV227 are designed specifically for long-exposure astrophotography with sensitive monochrome or color cameras.\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\u003eSII (Sulfur-II) Filter\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\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e672nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (FWHM)\u003c\/td\u003e\n\u003ctd\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e≥OD5 over 300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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\/4λ\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\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle Thread\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g \/ 0.44oz\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\/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":"Default Title","offer_id":52861237100829,"sku":"SV-W9187DA","price":131.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV227-2-SII-5nm-Narrowband-CCD-Filter-for-Deep-Sky-1_2a8aa192-1666-4ce7-b82b-c908d4dc5980.jpg?v=1788883710"},{"product_id":"svbony-sv227-h-alpha-5nm-narrowband-filter-2in","title":"SVBONY SV227 H-Alpha 5nm Narrowband Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the 656.3nm H-Alpha wavelength\u003c\/li\u003e\n\u003cli\u003eAggressive 5nm Full Width at Half Maximum (FWHM) bandpass\u003c\/li\u003e\n\u003cli\u003ePeak transmittance of ≥90% for high signal throughput\u003c\/li\u003e\n\u003cli\u003eDeep ≥OD5 blocking of unwanted wavelengths from 300-1000nm\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch (M48x0.75 thread) housing\u003c\/li\u003e\n\u003cli\u003e44mm clear aperture minimizes vignetting on larger sensors\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 SV227 2\" H-Alpha 5nm Narrowband CCD Filter\u003c\/h2\u003e\n      \u003cp\u003eThe SVBONY SV227 2\" H-Alpha 5nm Narrowband CCD Filter isolates the critical 656.3nm hydrogen-alpha emission line with a tight 5nm bandpass for maximum contrast. With peak transmittance rated at ≥90% and deep out-of-band blocking of ≥OD5 across the 300-1000nm range, this filter passes nebula signal while aggressively rejecting light pollution. The optical substrate is polished to a 1\/4λ surface parallelism, ensuring that the high resolution of your telescope is preserved in the final image.\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\u003eIsolating H-Alpha: The 5nm Bandpass at 656.3nm\u003c\/h3\u003e\n      \u003cp\u003eThe core of the SV227 is its ability to isolate a very specific slice of the red spectrum. The 5nm FWHM (Full Width at Half Maximum) is narrow enough to dramatically darken skyglow from city lights and moonlight, causing the faint structures within emission nebulae like the Heart Nebula (IC 1805) or Veil Nebula (NGC 6960) to stand out with stark contrast. Centered precisely on the 656.3nm H-alpha line, it captures the most dominant wavelength emitted by these deep-sky targets.\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\u003eOptical Integrity: ≥90% Transmission and OD5 Blocking\u003c\/h3\u003e\n      \u003cp\u003eA narrowband filter is only as good as its signal efficiency and its ability to block unwanted light. The SV227's coatings achieve a peak transmittance of ≥90%, ensuring that the faint H-alpha signal you're collecting isn't lost. Just as importantly, its ≥OD5 blocking rejects off-band light by a factor of 100,000, preventing bloated stars and washed-out backgrounds from compromising your long exposures.\u003c\/p\u003e\n        \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003e1\/4λ Surface Parallelism:\u003c\/strong\u003e Advanced polishing ensures the filter will not introduce distortions or degrade the sharpness of your optical system.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003e1.85mm Substrate:\u003c\/strong\u003e The thin glass substrate helps minimize focus shift when switching between filters in a wheel.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eSurface Quality (60\/40):\u003c\/strong\u003e A clean, professional-grade surface finish minimizes scatter and artifacts.\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\u003eMechanical Design: 2-Inch Format with 44mm Clear Aperture\u003c\/h3\u003e\n      \u003cp\u003eThe SV227 is housed in a standard 2-inch cell with M48x0.75 threads, making it compatible with virtually all modern filter wheels, filter drawers, and accessories. Its generous 44mm clear aperture provides an unvignetted field for cameras with APS-C or even larger sensors, ensuring even illumination from edge to edge. The filter features a single-thread design, intended for use within a filter holder rather than for stacking directly onto other filters or eyepieces.\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\u003e5nm vs. Wider Bandwidths: Contrast and Signal Trade-offs\u003c\/h3\u003e\n      \u003cp\u003eChoosing a bandwidth is a critical decision in narrowband imaging. The SV227's 5nm bandpass offers a significant advantage over wider 7nm or 12nm filters, especially under light-polluted skies, by providing a darker background and higher contrast. While a narrower 3nm filter might offer even more contrast, it requires longer exposure times to achieve the same signal level. The 5nm design represents a highly effective balance, delivering excellent contrast without demanding excessive sub-exposure times, making it a practical choice for a wide range of telescopes and sky conditions.\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 advantage of the SVBONY SV227's 5nm bandwidth?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary advantage of the \u003cstrong\u003e5nm bandwidth\u003c\/strong\u003e is significantly higher contrast compared to wider filters (like 7nm or 12nm). It does a better job of rejecting light pollution, moonlight, and natural skyglow, making faint nebula details pop against a darker background. This is especially beneficial for imagers in suburban or urban locations.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV227 5nm H-Alpha filter perform on the Pelican Nebula (IC 5070) from a suburban backyard?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe SV227 is ideal for this scenario. The Pelican Nebula is rich in H-alpha emissions. From a suburban backyard, the \u003cstrong\u003e5nm bandpass\u003c\/strong\u003e will effectively isolate the nebula's 656.3nm signal from city skyglow, allowing you to capture its intricate dust lanes and bright ionization fronts with much greater clarity than you could with a broadband or wider narrowband filter.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV227 2-inch filter a good match for a fast f\/4 Newtonian telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, but with a consideration. Fast optical systems can cause a slight \"band-shift\" in narrowband filters. While the SV227's 5nm bandpass is generally robust enough for systems down to f\/4, it offers a good balance between the contrast benefits of narrowband and tolerance for faster optics. The high ≥90% transmittance also helps gather signal efficiently in these fast systems.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does ≥OD5 blocking mean for my astrophotos with the SV227 filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOD5 blocking\u003c\/strong\u003e means the filter reduces unwanted light outside its 5nm bandpass by a factor of at least 100,000. For your images, this translates to:\n    \u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCleaner Backgrounds:\u003c\/strong\u003e It eliminates gradients caused by light pollution or moonlight.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTighter Stars:\u003c\/strong\u003e It prevents halos and bloating around bright stars caused by out-of-band emissions (like near-infrared).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigher Contrast:\u003c\/strong\u003e By ensuring only the desired 656.3nm light reaches the sensor, the nebula signal is maximized relative to the background noise.\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eThe SVBONY SV227 filter has a single M48x0.75 thread. Can I stack it with other filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this filter is not designed for stacking. The \u003cstrong\u003eSingle Thread: Yes\u003c\/strong\u003e specification indicates it has threads on one side only, meant for securing it into a filter wheel or filter drawer. It does not have female threads on the opposite side to attach another filter directly to it.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 1.85mm substrate thickness of the SV227 filter parfocal with other filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e1.85mm thickness\u003c\/strong\u003e is quite thin, which helps minimize focus shift between filters. However, achieving perfect parfocal performance across an entire set of filters from different manufacturers is rare. While the SV227 is designed to be close, you should expect to make minor focus adjustments when switching between it and other filters, especially those with different substrate thicknesses.\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 Type\u003c\/td\u003e\n\u003ctd\u003eH-Alpha Narrowband\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\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e656.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBandpass (FWHM)\u003c\/td\u003e\n\u003ctd\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥90%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003e≥OD5\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\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\/4λ\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eThreading\u003c\/td\u003e\n\u003ctd\u003eSingle Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g \/ 0.44oz\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\"\u003eSVBONY SV227 2\" H-Alpha 5nm 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\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":"Default Title","offer_id":52861237133597,"sku":"SV-W9187DB","price":131.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV227-2-H-Alpha-5nm-Narrowband-CCD-Filter-for-Deep-Sky-1_ab1cee9f-5a35-4f02-889e-fbc732a5f309.jpg?v=1788883673"},{"product_id":"svbony-sv227-oiii-5nm-narrowband-filter-2in","title":"SVBONY SV227 OIII 5nm Narrowband Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the Oxygen III emission line at 500.7nm\u003c\/li\u003e\n\u003cli\u003eExtremely narrow 5nm Full Width at Half Maximum (FWHM) bandpass\u003c\/li\u003e\n\u003cli\u003eAchieves ≥90% peak light transmittance at the OIII line\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch format with M48x0.75 filter threads\u003c\/li\u003e\n\u003cli\u003ePrecision 1.85mm thick substrate with 1\/4λ surface parallelism\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 SV227 OIII 5nm 2-inch Telescope Filter\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV227 OIII 5nm 2-inch filter is engineered to isolate the doubly ionized oxygen signal from planetary nebulae and supernova remnants with extreme prejudice. Its tight 5nm bandpass is centered precisely at the 500.7nm wavelength, achieving ≥90% peak transmittance to capture faint structures while suppressing overwhelming light pollution. The optical substrate is held to a 1\/4λ parallelism with a 60\/40 surface quality, ensuring the filter preserves the sharpness of your optical system across its full 44mm clear aperture.\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\u003eIsolate Nebulae with a 5nm FWHM Bandpass\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV227 filter's imaging capability is its extremely narrow 5nm Full Width at Half Maximum (FWHM). This tight window, centered at 500.7nm, passes light almost exclusively from the OIII emission line, which is critical for revealing the delicate, glowing structures within planetary nebulae like the Dumbbell Nebula (M27) or the faint, expansive shells of supernova remnants like the Veil Nebula (NGC 6960).\u003c\/p\u003e\n\u003cp\u003eBy rejecting nearly all other wavelengths across its 300-1000nm blocking range, the filter dramatically increases contrast and allows you to pull faint details out from even heavily light-polluted skies. With a peak transmittance of ≥90%, the filter passes the maximum amount of critical signal to your sensor, keeping exposure times manageable for such a narrow bandpass.\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\/4λ Substrate for Sharp Stars Across the Field\u003c\/h3\u003e\n\u003cp\u003eA filter is part of your optical train, and any imperfection can degrade the final image. The SV227 is built on a 1.85mm thick glass substrate polished to a 1\/4λ surface parallelism and a 60\/40 surface quality. This level of precision prevents the filter from introducing astigmatism or other distortions that can elongate stars, especially towards the edge of the field.\u003c\/p\u003e\n\u003cp\u003eThe 30\" parallelism specification ensures the two faces of the filter are almost perfectly parallel, minimizing any wedge effect that could cause image shift or focus problems when swapping between filters in a wheel. This attention to optical quality means your stars remain as tight and round as your telescope's optics can deliver.\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\u003e2-Inch Format with a 44mm Clear Aperture\u003c\/h3\u003e\n\u003cp\u003eDesigned for modern imaging setups, the SV227 comes in a standard 2-inch cell with M48x0.75 threads. This makes it directly compatible with most 2-inch filter wheels, filter drawers, and dedicated astronomy cameras. The filter provides a generous 44mm clear aperture, large enough to fully illuminate full-frame sensors without introducing vignetting from the filter cell itself.\u003c\/p\u003e\n\u003cp\u003eDespite its robust optical specifications, the filter is remarkably light, weighing only 12.5g. This low mass helps maintain the balance of your imaging train and reduces the strain on focuser motors and filter wheel mechanisms during operation.\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\u003e5nm vs. Wider OIII Filters: The Contrast Trade-Off\u003c\/h3\u003e\n\u003cp\u003eChoosing a narrowband filter involves a trade-off between contrast and exposure time. The SV227's 5nm bandpass represents a move towards higher contrast and better suppression of unwanted light.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSVBONY SV227 5nm Filter:\u003c\/strong\u003e Its primary advantage is maximum contrast. It darkens the sky background more effectively than wider filters, making it superior for pulling out the faintest details from emission nebulae, especially from urban or suburban locations. The trade-off is that it requires longer sub-exposure times to gather the same amount of signal as a wider filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider 7nm or 12nm Filters:\u003c\/strong\u003e These filters are more forgiving, allowing for shorter sub-exposures. However, they let in more skyglow and continuum emission from stars, resulting in a brighter background and slightly lower overall contrast on the nebula itself. They are often a good starting point, but the 5nm is the specialist's tool for difficult 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\"\u003eHow will the SVBONY SV227 5nm filter perform on the Veil Nebula (NGC 6960) from a Bortle 7 zone?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV227 is ideal for this exact scenario. The Veil Nebula is a classic OIII-rich supernova remnant, but its faint, filamentary structure is easily lost in skyglow. The tight \u003cstrong\u003e5nm bandpass\u003c\/strong\u003e will aggressively reject the Bortle 7 light pollution, dramatically increasing contrast and making the nebula's delicate wisps stand out against a dark background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 1.85mm substrate thickness of the SV227 filter parfocal with other brands?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1.85mm thickness\u003c\/strong\u003e is very close to the thickness of many other popular filter brands. While perfect parfocality is never guaranteed across different manufacturers, this thickness should result in minimal focus shift when used in a filter wheel alongside other modern narrowband or LRGB filters. You may need only a very small focus adjustment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the ≥OD5 blocking on the SV227 OIII filter mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD5 blocking\u003c\/strong\u003e means the filter blocks out-of-band light by a factor of 100,000 (Optical Density 5). This is a high level of blocking that ensures light from streetlights, the moon, and unwanted wavelengths from stars does not leak through and cause halos or gradients in your final image. It's a critical specification for clean, high-contrast astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV227 OIII filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically possible on very bright planetary nebulae like the Ring Nebula (M57) with a large aperture telescope, it's generally not recommended. The \u003cstrong\u003e5nm bandpass\u003c\/strong\u003e is so restrictive that it makes the view extremely dim, and most stars will disappear entirely. This filter is designed specifically for long-exposure astrophotography, not visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 44mm clear aperture of the SV227 important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e44mm clear aperture\u003c\/strong\u003e is larger than the diagonal of an APS-C sensor and nearly matches the diagonal of a full-frame sensor. This ensures that even with a fast optical system, the filter housing itself will not block light at the corners of your sensor, preventing vignetting and ensuring even illumination across your entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the M48x0.75 single thread on the SV227 filter cause any issues?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is standard. The \u003cstrong\u003eM48x0.75 single thread\u003c\/strong\u003e is on the side of the filter that threads into your camera or filter wheel. The other side is unthreaded. This design prevents you from accidentally stacking filters, which can cause internal reflections and degrade image quality. It ensures the filter is always mounted correctly in the optical 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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eOIII Narrowband\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\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e500.7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM)\u003c\/td\u003e\n\u003ctd\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003e≥OD5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44mm\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\/4λ\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\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreading\u003c\/td\u003e\n\u003ctd\u003eSingle-Sided\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g \/ 0.44oz\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\/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":"Default Title","offer_id":52861237166365,"sku":"SV-W9187DC","price":131.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV227-OIII-5nm-2-inch-Telescope-Filter-for-Nebula-Imaging-1_244e2422-e55d-42dd-bedc-ce93fe8bab7c.jpg?v=1788883686"},{"product_id":"svbony-sv240-near-infrared-multi-narrowband-light-pollution-filter","title":"SVBONY SV240 Near-Infrared Multi-Narrowband Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for urban astrophotography with one-shot color cameras\u003c\/li\u003e\n\u003cli\u003ePasses H-Alpha, OIII, H-Beta, and Near-Infrared (NIR) wavelengths\u003c\/li\u003e\n\u003cli\u003ePeak transmittance over 95% for H-Alpha (656.3nm) and H-Beta (486.1nm)\u003c\/li\u003e\n\u003cli\u003eFeatures a wide 115nm FWHM bandpass in the NIR spectrum\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch (M48x0.75) threaded 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 SV240 2\" NIR Multi Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV240 2\" NIR Multi Narrowband Filter is engineered for one-shot color imaging from light-polluted urban skies, capturing four critical spectral regions in a single exposure. This filter delivers peak transmittance of over 95% at H-Alpha (656.3nm) and H-Beta (486.1nm), and over 92% for OIII (495.9nm), while simultaneously opening a 115nm-wide window in the near-infrared with an average transmission greater than 95% between 830-870nm. Its 2mm substrate thickness and 1\/4λ surface parallelism ensure your optical system's sharpness is maintained, all within a standard M48x0.75 threaded cell.\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\u003eTriple-Bandpass Design: Over 92% Transmission on Key Nebula Lines\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV240 is its ability to isolate the three most important emission nebula spectral lines from the glare of city lights. With a peak transmission of \u0026gt;95% at H-Alpha (656.3nm), \u0026gt;92% at OIII (495.9nm), and \u0026gt;95% at H-Beta (486.1nm), the filter gathers maximum signal from your target. This high transmission is paired with aggressive blocking of common light pollution sources, achieving \u0026gt;OD4 suppression in the 560-620nm range, effectively eliminating the orange glow from sodium vapor lamps.\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 115nm Near-Infrared Window for Modern CMOS Sensors\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional tri-band filters, the SV240 includes a fourth, wide passband in the near-infrared, spanning 830-870nm with an average transmission over 95%. This 115nm FWHM window is designed to leverage the high quantum efficiency of modern color CMOS sensors (like the Sony IMX585 and IMX464) in the NIR region. By capturing this additional signal, which is less affected by artificial light pollution, you can significantly boost the signal-to-noise ratio and contrast of your final image without complex processing. Note that imaging in the NIR band can sometimes introduce halos around bright stars, a known trade-off for the increased signal.\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\u003e2mm Substrate and 1\/4λ Parallelism for Sharp Stars\u003c\/h3\u003e\n\u003cp\u003eOptical precision is maintained by constructing the SV240 from a 2mm thick substrate with a surface parallelism of 1\/4λ. This ensures the filter will not introduce a significant focus shift or degrade the sharpness of your starfield, even in fast optical systems. The filter is housed in a standard 2-inch cell with M48x0.75 threads, making it compatible with most filter wheels, drawers, and camera nosepieces, while the 44mm clear aperture prevents vignetting on larger 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\u003eSvbony SV240 vs. SV220: Adding the H-Beta and NIR Bands\u003c\/h3\u003e\n\u003cp\u003eThe SV240 represents a significant evolution from a standard dual-bandpass filter like the Svbony SV220. While the SV220 is highly effective at isolating H-Alpha and OIII, the SV240 expands on this capability in two key ways.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eH-Beta Passband:\u003c\/strong\u003e The SV240 adds a dedicated passband for Hydrogen-Beta, crucial for capturing the full color and detail in objects like the Horsehead Nebula (Barnard 33) and California Nebula (NGC 1499).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNear-Infrared (NIR) Window:\u003c\/strong\u003e The SV240's primary advantage is its 115nm-wide NIR passband. This feature is specifically designed for modern color cameras highly sensitive to NIR light, allowing you to gather more signal data from a broader range of targets, including galaxies and star-forming regions, than is possible with the SV220.\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 Svbony SV240 filter's NIR band help with imaging the Orion Nebula (M42) from the city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Orion Nebula (M42) has strong emissions in H-Alpha, OIII, and H-Beta, which the \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e captures with \u0026gt;92% transmission. The added 115nm-wide NIR band captures additional signal from the star-forming regions deep within the nebula. Since urban light pollution has less impact in the NIR, this fourth band boosts your overall signal-to-noise ratio, revealing fainter details than a traditional tri-band filter could from the same location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony SV240 a good choice for my color camera with an IMX585 sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an excellent choice. The \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e was specifically designed with sensors like the Sony IMX585 in mind. These modern CMOS chips have very high quantum efficiency in the near-infrared. The filter's \u0026gt;95% average transmission in the 830-870nm range is designed to leverage this sensitivity, allowing you to collect significantly more data and achieve higher-contrast images.\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 SV240 and a standard UHC or CLS filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUHC and CLS (City Light Suppression) filters are broadband filters that pass a much wider range of the spectrum, which can still let significant light pollution through. The \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e is a multi-narrowband filter with much tighter bandpasses (20nm and 24nm for OIII\/H-Beta and H-Alpha) that isolate specific emission lines with high precision. This results in much darker skies, higher contrast on nebulae, and the ability to image from more heavily light-polluted areas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV240 filter with my 8\" f\/4 Newtonian for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While galaxies like Andromeda (M31) are broadband targets, the \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e can still be very effective. It will capture the H-Alpha signal from the star-forming regions in the galaxy's spiral arms while suppressing city glow. The NIR band is also beneficial, as it captures signal from the older, redder star populations in the galactic core. The filter's 1\/4λ parallelism ensures it performs well with your fast f\/4 optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Svbony SV240 have three different FWHM values (24nm, 20nm, 115nm)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe different Full-Width Half-Maximum (FWHM) values correspond to the different passbands of the \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e filter. The 24nm and 20nm bandpasses are for the visible light emission lines (H-Alpha, H-Beta, OIII), providing a tight but manageable window for capturing nebula detail. The much wider 115nm FWHM is for the near-infrared (NIR) band, designed to gather as much signal as possible from this region where modern sensors are highly sensitive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to refocus when using the 2mm thick Svbony SV240 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e uses a 2mm thick substrate, which is a common standard. While any filter will shift the focal point slightly, a 2mm thickness is generally considered \"parfocal\" with many other modern filters. The shift will be minimal, but for critical sharpness, especially in fast telescopes, it is always best practice to check and refine focus after inserting any filter into the optical path.\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\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eMulti-Narrowband Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV240\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\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e300-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e24nm \u0026amp; 20nm \u0026amp; 115nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003eT＞95%@656.3nm (H-α)\u003cbr\u003eT＞95%@486.1nm (H-β)\u003cbr\u003eT＞92%@495.9nm (OIII)\u003cbr\u003eT\u0026gt;85%@500.7nm (OIII)\u003cbr\u003eTavg\u0026gt;95%@830-870nm (NIR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD5 @ 300-450nm\u003cbr\u003e\u0026gt;OD4 @ 560-620nm\u003cbr\u003e\u0026gt;OD2 @ 690-750nm\u003cbr\u003e\u0026gt;OD3 @ 940-1100nm\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\/4λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle Thread\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g \/ 0.44oz\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\/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":52861237199133,"sku":"SV-W9191B","price":126.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861237231901,"sku":"SV-W9191A","price":168.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV240-1-25-Multi-Narrowband-Filter-for-Urban-Astrophotography-1_9a989526-8ef6-408f-827e-43d86ba7f618.jpg?v=1788660312"},{"product_id":"svbony-sv260-5-bandpass-light-pollution-filter-2in","title":"SVBONY SV260 5-Bandpass Light Pollution Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e5-Bandpass broadband light pollution filter\u003c\/li\u003e\n\u003cli\u003e2-inch size with M48x0.75 thread\u003c\/li\u003e\n\u003cli\u003eOver 90% peak transmittance for high signal\u003c\/li\u003e\n\u003cli\u003eOD4 blocking of key light pollution bands\u003c\/li\u003e\n\u003cli\u003e44mm clear aperture to minimize vignetting\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 SV260 5 Bandpass Light Pollution Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV260 5 Bandpass Filter uses a multi-broadband design to reclaim the deep sky from city lights, achieving over 90% peak transmittance to preserve natural color in galaxies and star clusters. Its optical design provides greater than OD4 blocking on critical light pollution sources while maintaining a wide 300-1000nm wavelength range. The 2-inch cell features a full 44mm clear aperture, ensuring unvignetted coverage for large-format 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\u003eOD4 Blocking: Isolating Specific Light Pollution Sources\u003c\/h3\u003e\n\u003cp\u003eThe SV260's primary function is to surgically remove the most common wavelengths of artificial skyglow. It achieves an Optical Density (OD) of 4 or greater in the 350-400nm and 720-1100nm ranges, effectively blocking over 99.99% of unwanted light from these sources. Specific high-pressure sodium (Na) and mercury (Hg) vapor streetlight emissions are heavily suppressed, darkening the image background and dramatically increasing contrast on your target.\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\u003e5-Bandpass Design: Capturing Full-Spectrum Color at 90% Transmittance\u003c\/h3\u003e\n\u003cp\u003eUnlike narrowband filters that isolate single emission lines, the SV260 passes light in five distinct bands across the spectrum. This approach allows the faint, continuous spectra of broadband targets—such as the dusty arms of a galaxy or the blue glow of a reflection nebula—to reach your sensor. With a peak transmittance of over 90%, the filter maximizes the signal you want to capture, resulting in shorter total integration times and images with more accurate, vibrant 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\u003eOptical Build: A 44mm Clear Aperture for Modern Sensors\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern imaging systems, the SV260 is built into a standard 2-inch filter cell with M48x0.75 threads for universal compatibility with filter wheels and camera nosepieces. The filter features a generous 44mm clear aperture, which is critical for preventing vignetting on cameras with APS-C or larger sensors. The 2mm substrate thickness maintains optical precision, with a surface parallelism of 1\/2λ to avoid introducing distortions into the light 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\u003eSV260 vs. Narrowband Filters: Choosing Natural Color Over Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eAn imager's choice of filter depends entirely on the target. The SV260 excels where narrowband filters fall short.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroadband Targets:\u003c\/strong\u003e For galaxies like Andromeda (M31), reflection nebulae like the Pleiades (M45), and globular clusters like M13, the SV260 is the correct tool. It preserves the natural stellar colors and faint outer structures that narrowband imaging completely misses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission Nebulae:\u003c\/strong\u003e For targets dominated by Hydrogen-alpha and Oxygen-III, such as the North American Nebula (NGC 7000), a dedicated narrowband or dual-band filter will provide higher contrast. The trade-off is the loss of natural star color and the need for complex color mapping in processing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SV260 is designed for one-shot-color cameras, delivering a more authentic representation of the night sky directly from your data, making it an essential tool for capturing the full diversity of deep-sky objects.\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 kind of objects is the Svbony SV260 filter best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Svbony SV260 is a broadband filter designed for deep-sky objects that emit light across a wide spectrum. It is ideal for imaging \u003cstrong\u003egalaxies, star clusters (both open and globular), and reflection nebulae\u003c\/strong\u003e, where preserving natural color and capturing faint starlight is the primary goal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV260 perform on the Andromeda Galaxy (M31) from a suburban backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV260 is an excellent choice for imaging M31 from light-polluted areas. It will significantly darken the sky background by blocking sodium and mercury vapor light, which increases the contrast of Andromeda's faint outer arms and dust lanes. Because it's a broadband filter, it will also preserve the true colors of the galaxy's core, star-forming regions, and surrounding starfield.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does OD4 blocking mean on the SV260 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD4\u003c\/strong\u003e stands for \u003cstrong\u003eOptical Density 4\u003c\/strong\u003e. This is a logarithmic scale that measures how much light is blocked. An OD4 rating means the filter transmits only 1\/10,000th (or 0.01%) of the light at that specific wavelength. The SV260's OD4 blocking on key light pollution bands ensures that unwanted artificial skyglow is almost entirely eliminated from your images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I use the Svbony SV260 or a UHC filter for the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis depends on your goal. The Orion Nebula (M42) has both strong emission regions (H-alpha, O-III) and a significant reflection component (the surrounding blue dust). A UHC (Ultra High Contrast) filter will provide more aggressive contrast on the glowing gas but will suppress the reflection nebula and alter star colors. The \u003cstrong\u003eSvbony SV260 will produce a more natural-looking image\u003c\/strong\u003e, capturing both the pinkish emission gas and the blue reflection dust with better color fidelity, making it a great choice for a true-color rendition of the entire complex.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2-inch SV260 filter work with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Svbony SV260 is well-suited for larger sensors. It features a \u003cstrong\u003e44mm clear aperture\u003c\/strong\u003e, which is larger than many standard 2-inch filters. This wide aperture helps prevent vignetting (darkening of the corners) on cameras with sensors up to and including full-frame format, provided the rest of your optical train is also properly illuminated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Svbony SV260 replace the need for calibration frames?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. While the SV260 controls light pollution and improves your raw data, you must still shoot calibration frames. \u003cstrong\u003eDarks, biases, and especially flats are still required\u003c\/strong\u003e to correct for sensor noise, dust motes, and any remaining gradients to achieve the best possible final 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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eMulti-Broadband Filter\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\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle Thread\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: UV\/IR\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD4 @ 350-400nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: IR\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD4 @ 720-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD2 @ 435.8nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD1 @ 546.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD3 @ 577nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD3 @ 578.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Sodium (Na)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD2 @ 589.6nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Neutral (Hg\/Na)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD2 @ 589nm\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\/2λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g \/ 0.44oz\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\/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":"2\" Round Mounted","offer_id":52861267214621,"sku":"SV-W9194A","price":175.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV260-5-Bandpass-Filter-Light-Pollution-Deep-Sky-Photography-1_eb6d63fd-a1dd-48d9-8cf5-41f43ca5546f.jpg?v=1788883781"}],"url":"https:\/\/davidastro.com\/fr\/collections\/svbony-filters.oembed","provider":"David Astro","version":"1.0","type":"link"}