{"title":"SVBONY Light Pollution Filters","description":"\u003cp\u003eSVBONY's light pollution filters include the SV260 2\" multi-bandpass filter for imaging and a 2\" CLS filter. UHC filters in 1.25\" and 2\" add stronger contrast on emission nebulae. Part of \u003ca href=\"\/collections\/light-pollution-filters\"\u003eLight Pollution \u0026amp; Broadband Filters\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"svbony-sv260-2-multi-bandpass-light-pollution-filter","title":"SVBONY SV260 2″ Multi-Bandpass Light Pollution Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961075189920996204892.webp?v=1791667879\" alt=\"SVBONY SV260 5-bandpass broadband light pollution filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV260 is a 2″ multi-bandpass broadband light-pollution filter. Instead of two narrow emission lines, it passes several wider windows across the visible spectrum and blocks the specific wavelengths emitted by mercury and sodium street lighting, as well as ultraviolet below 400 nm and infrared from 720 to 1100 nm at OD4. SVBONY rates peak transmittance at 90%. The filter has a 2 mm substrate, 44 mm clear aperture, 60\/40 surface quality and 1\/2λ parallelism, in an M48 x 0.75 cell, and weighs 12.5 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image from a suburban or town site and want to cut sky glow on broadband targets such as galaxies, reflection nebulae and star fields, where a narrowband filter would remove too much of the signal and star colour.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-bandpass design:\u003c\/strong\u003e transmits several emission and continuum windows while rejecting common artificial-light lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTargeted blocking:\u003c\/strong\u003e mercury lines at 435.8, 546.1, 577 and 578.1 nm and the sodium line at 589.6 nm, with published optical densities from OD1 to OD3.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD4 UV and IR cut:\u003c\/strong\u003e 350–400 nm and 720–1100 nm, which keeps stars tight and colour balanced on colour sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90% peak transmittance\u003c\/strong\u003e in the pass windows.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ M48 x 0.75 cell\u003c\/strong\u003e with a 44 mm clear aperture.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961087423671314038635.jpg?v=1791667879\" alt=\"SVBONY SV260 90% peak transmittance and OD4 cut-off depth\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961081044881729871624.jpg?v=1791667879\" alt=\"SVBONY SV260 comparison without light pollution filter\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961082412951115249410.jpg?v=1791667879\" alt=\"SVBONY SV260 300-1000nm working range with UV and IR cut\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalaxies and star clusters\u003c\/strong\u003e from light-polluted skies.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eWide star fields and Milky Way regions.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission nebulae\u003c\/strong\u003e in broadband colour, where a dual-band filter would be too selective.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour cameras and DSLRs\u003c\/strong\u003e where a UV\/IR cut is also needed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961078382411564073354.webp?v=1791667879\" alt=\"SVBONY SV260 star field imaging in a Bortle 6 light pollution area\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961084951087152114363.jpg?v=1791667879\" alt=\"SVBONY SV260 star field imaging under light pollution\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961091757278756000869.jpg?v=1791667879\" alt=\"SVBONY SV260 broadband deep-sky imaging from a light-polluted site\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M48 x 0.75 standard 2″ filter thread, for filter drawers, filter wheels and 2″ nosepieces with filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e one-shot-colour astronomy cameras and DSLRs; it also includes the UV\/IR blocking these sensors need.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter drawers:\u003c\/strong\u003e SVBONY SV226 filter drawers take 2″ M48 filters, which makes it easy to swap between the SV260 and a narrowband filter during a session.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961091786982476064865.jpg?v=1791667879\" alt=\"SVBONY SV260 light pollution filter imaging comparison\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961091817012811505061.jpg?v=1791667879\" alt=\"SVBONY SV260 light pollution filter star field result\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386961091847895957183090.jpg?v=1791667879\" alt=\"SVBONY SV260 filter use with colour cameras in light-polluted skies\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging filter:\u003c\/strong\u003e SVBONY designs it for deep-sky and star-field photography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroadband, not narrowband:\u003c\/strong\u003e it reduces sky glow rather than eliminating it. For emission nebulae under very bright skies, a dual-band filter such as the SVBONY SV220 isolates the emission lines more strongly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED lighting:\u003c\/strong\u003e the published blocking lines are mercury and sodium; broad-spectrum white LED light falls partly inside the pass windows.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal ratio:\u003c\/strong\u003e SVBONY does not publish a focal-ratio rating for this filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlocking data:\u003c\/strong\u003e two entries of SVBONY's published blocking list could not be read from the vendor page and are omitted from the specification table.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387244826710371677730187.jpg?v=1791667879\" alt=\"SVBONY SV260 broadband filter star field comparison in light pollution\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads into any M48 x 0.75 filter thread or 2″ filter drawer, and focus is set with the filter in place as usual.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is it different from a dual-band filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe SV260 passes several broad windows and keeps natural star colour, which suits galaxies and star fields. A dual-band filter passes only H-alpha and OIII and suits emission nebulae.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I still need a UV\/IR cut filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The SV260 blocks 350–400 nm and 720–1100 nm at OD4 itself.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ M48 multi-bandpass filter that blocks mercury and sodium light pollution plus UV and IR, for broadband deep-sky and star-field imaging from town and suburban sites.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721434234991,"sku":"W9194A","price":178.11,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9194a-1_20251127144515_4927.webp?v=1791665350"},{"product_id":"svbony-2-cls-light-pollution-filter","title":"SVBONY 2″ CLS Light Pollution Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037897001893449065357.jpg?v=1791669877\" alt=\"SVBONY CLS light pollution filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9155B is a 2″ CLS (City Light Suppression) filter in a standard M48 x 0.75 cell. It is a broadband light pollution filter: SVBONY specifies about 90% transmission at the main nebula emission lines (H-alpha 656 nm, OIII 496 nm, H-beta 486 nm, SII 672 nm) and about 0.1% transmission at the sodium (589 nm) and mercury (435 nm and 578 nm) lines produced by street lighting. The coated glass is 1.85 mm thick.\u003c\/p\u003e\u003cp\u003eA CLS filter does not remove light pollution or make an object brighter. It raises the contrast between nebulae and a skyglow-brightened background, which is what makes faint structure easier to see and to stretch in processing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image or observe from a suburban or city-edge site with a colour astronomy camera or an unmodified DSLR and want more contrast on emission nebulae. SVBONY designs it with colour CCD\/CMOS cameras and unmodified DSLRs in mind.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9155-2_20250807105838_0327.jpg?v=1791669878\" alt=\"SVBONY CLS light pollution filter for deep-sky imaging and observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission lines passed:\u003c\/strong\u003e about 90% transmission at H-alpha, OIII, H-beta and SII (SVBONY figures).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStreet-light lines suppressed:\u003c\/strong\u003e about 0.1% transmission at sodium 589 nm and mercury 435\/578 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard coatings:\u003c\/strong\u003e electron-beam evaporation with ion-assisted deposition, for scratch resistance and stable performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEven coating:\u003c\/strong\u003e SVBONY uses a planetary rotation system in the coating chamber for consistent passbands across the glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2″ cell:\u003c\/strong\u003e M48 x 0.75 thread, 1.85 mm glass.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6372973214719458219689724.jpg?v=1791669877\" alt=\"SVBONY CLS filter emission-line transmission and light pollution suppression panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour deep-sky imaging from light-polluted sites:\u003c\/strong\u003e emission nebulae such as M42, the Lagoon and North America Nebula.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDSLR astrophotography:\u003c\/strong\u003e with unmodified cameras through a 2″ nosepiece or filter drawer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e a darker background and better nebula contrast at sub-rural sites.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9155-3_20250807105838_1715.jpg?v=1791669878\" alt=\"SVBONY CLS light pollution filter for deep-sky imaging and observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M48 x 0.75, for 2″ barrels, diagonals, filter drawers and 2″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther sizes:\u003c\/strong\u003e SVBONY also makes this filter in 1.25″ (F9155A, M28.5 x 0.6) and as a Canon EOS-C clip-in (F9155D).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLS vs UHC:\u003c\/strong\u003e SVBONY notes that the CLS has a wider passband than its UHC filter and suits sites with less light pollution; the UHC is the stronger choice under brighter skies.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you want help choosing between CLS, UHC and a dual-band filter for your sky and camera, get in touch and we will work through it with you.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9155-5_20250807105838_6356.jpg?v=1791669878\" alt=\"SVBONY CLS light pollution filter for deep-sky imaging and observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9155-4_20250807105920_2311.jpg?v=1791669878\" alt=\"SVBONY CLS light pollution filter for deep-sky imaging and observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroadband filters favour emission nebulae:\u003c\/strong\u003e galaxies and star clusters emit across the whole spectrum, so their gain from a CLS filter is smaller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour cast:\u003c\/strong\u003e as with any light pollution filter, images show a colour shift that is corrected in processing with a colour calibration step.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads into any M48 x 0.75 filter thread on a 2″ nosepiece, diagonal or filter drawer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work under a dark sky?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt still passes the emission lines, but its benefit is greatest where sodium and mercury lighting brighten the background.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with a modified DSLR?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY designs it for colour cameras and unmodified DSLRs. It passes H-alpha, so it also works on a modified camera.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. SVBONY lists both visual and photographic use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ M48 broadband CLS filter that suppresses sodium and mercury street-light lines while passing H-alpha, OIII, H-beta and SII, raising nebula contrast for colour imaging and observing from light-polluted skies.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"2″","offer_id":67722175021167,"sku":"F9155B","price":54.25,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9155-1_20250807105837_9118_20260820155328_8780.webp?v=1791669877"},{"product_id":"svbony-1-25-uhc-light-pollution-filter","title":"SVBONY 1.25″ UHC Light Pollution Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6368834932617211706668990.jpg?v=1791669897\" alt=\"SVBONY UHC light pollution filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9131A is a 1.25″ UHC (Ultra High Contrast) filter in a standard M28.5 x 0.6 cell. It is a narrower-passband light pollution filter than a CLS: it reduces light from mercury-vapour and sodium-vapour lamps and the natural oxygen airglow of the atmosphere, while passing the emission lines of nebulae. The result is a darker sky background and higher contrast on emission and planetary nebulae. The coated optical glass is 1.85 mm thick in an aluminium frame, and the filter ships in a transparent storage case.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe or image emission nebulae from urban or suburban skies through a 1.25″ eyepiece or imaging train and want the background darkened noticeably more than a broadband filter would.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9131a_20250807111258_9145.jpg?v=1791669899\" alt=\"SVBONY F9131A 1.25″ UHC light pollution filter for nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-high contrast passband:\u003c\/strong\u003e selectively reduces artificial-light wavelengths so emission nebulae stand out from the sky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarker background:\u003c\/strong\u003e SVBONY rates the sky background darker and nebula contrast higher than with typical broadband filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical glass in an aluminium frame:\u003c\/strong\u003e 1.85 mm coated substrate built for frequent use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 1.25″ cell:\u003c\/strong\u003e M28.5 x 0.6 thread fits most 1.25″ eyepieces, diagonals and accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e supplied in a transparent case.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029079471920178388140.jpg?v=1791669898\" alt=\"SVBONY UHC filter nebula contrast and light pollution blocking panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing of emission nebulae:\u003c\/strong\u003e the Orion, Lagoon, Swan and Veil nebulae from suburban sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae:\u003c\/strong\u003e the Ring and Dumbbell show more clearly against a darkened background.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour imaging under bright skies:\u003c\/strong\u003e more contrast on emission targets with a 1.25″ imaging train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20260304091845_2351.webp?v=1791669898\" alt=\"SVBONY UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20260304091847_9948.webp?v=1791669898\" alt=\"SVBONY UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M28.5 x 0.6, the standard 1.25″ filter thread on eyepieces, diagonals and nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther sizes:\u003c\/strong\u003e SVBONY also makes this filter in 2″ (F9131B, M48 x 0.75) and as a Canon EOS-C clip-in (F9131D).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUHC vs CLS:\u003c\/strong\u003e the UHC has the narrower passband and suits brighter skies; SVBONY's CLS filter is the wider option for less light-polluted sites.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3_20260304091850_2188.webp?v=1791669898\" alt=\"SVBONY UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x 1.25″ UHC filter (F9131A)\u003c\/li\u003e\n\u003cli\u003e1 x transparent storage case\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest on emission objects:\u003c\/strong\u003e galaxies and star clusters are broadband targets and gain little from a UHC filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimmer stars and colour shift:\u003c\/strong\u003e the narrower passband dims stars visually and gives images a colour cast that is corrected in processing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads into the filter thread at the bottom of a 1.25″ eyepiece or the nosepiece of a diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it for visual use or imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBoth. SVBONY presents it for visual observing and astrophotography.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I choose UHC or CLS?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eUnder brighter suburban or city skies the UHC gives more contrast. Under moderately dark skies the wider CLS keeps more starlight. Get in touch if you want help choosing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ M28.5 UHC filter that darkens light-polluted skies and lifts emission and planetary nebulae, for visual observing and imaging through standard 1.25″ gear.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"1.25″","offer_id":67722179149935,"sku":"F9131A","price":34.2,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9131a_20250807111258_9145.jpg?v=1791669899"},{"product_id":"svbony-2-uhc-light-pollution-filter","title":"SVBONY 2″ UHC Light Pollution Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6368834932617211706668990_2b7a8944-e92a-4f39-80d0-0698ee7d0c81.jpg?v=1791670033\" alt=\"SVBONY 2″ UHC light pollution filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is the 2″ version of the SVBONY UHC (Ultra High Contrast) light pollution filter. A UHC filter has a narrower passband than a broadband CLS filter: it reduces light from mercury-vapour and sodium-vapour street lamps and the natural oxygen airglow of the atmosphere while passing the emission lines of nebulae. The sky background turns darker and emission and planetary nebulae gain contrast. SVBONY builds it with an optical glass element in an aluminium frame and supplies it in a transparent storage case.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe or image emission nebulae from urban or suburban skies with a 2″ diagonal, 2″ eyepieces or a 2″ imaging train, and want the background darkened more than a broadband filter would manage.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9131b-1_20250807111141_9843--1-_20260810104404_3573.webp?v=1791670034\" alt=\"SVBONY F9131B 2″ UHC light pollution filter for nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-high contrast passband:\u003c\/strong\u003e selectively reduces artificial-light wavelengths so emission nebulae stand out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarker background:\u003c\/strong\u003e SVBONY rates the background darker and nebula contrast higher than with typical broadband filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical glass in an aluminium frame:\u003c\/strong\u003e built for frequent use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ format:\u003c\/strong\u003e for low-power, wide-field eyepieces and larger imaging sensors where a 1.25″ filter would vignette.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029079471920178388140_c205687b-ed74-4a3e-a2a8-22d92ed9b066.jpg?v=1791670033\" alt=\"SVBONY 2″ UHC filter nebula contrast and light pollution blocking panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field visual observing of emission nebulae:\u003c\/strong\u003e the Veil, North America and Orion nebulae through 2″ low-power eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae:\u003c\/strong\u003e improved contrast on the Ring, Dumbbell and Helix.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour imaging under bright skies:\u003c\/strong\u003e emission targets through a 2″ nosepiece or filter drawer.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20260304091845_2351_df631f57-2432-4dc6-88b1-1552397b3ffc.webp?v=1791670034\" alt=\"SVBONY 2″ UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20260304091847_9948_2ead0446-5acc-4522-ad74-697a42a61181.webp?v=1791670034\" alt=\"SVBONY 2″ UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit:\u003c\/strong\u003e threads into the filter thread of 2″ eyepieces, diagonals, nosepieces and filter drawers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ trains:\u003c\/strong\u003e SVBONY makes the same filter in 1.25″ (F9131A), which we also list.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUHC vs CLS:\u003c\/strong\u003e the UHC suits brighter skies; SVBONY's CLS is the wider-band option for moderately dark sites.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3_20260304091850_2188_58b0a4b5-efef-4fbc-8f5f-fb9b3359527c.webp?v=1791670034\" alt=\"SVBONY 2″ UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest on emission objects:\u003c\/strong\u003e galaxies and star clusters are broadband targets and gain little from a UHC filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimmer stars and colour shift:\u003c\/strong\u003e the narrower passband dims stars visually and gives images a colour cast that is corrected in processing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads by hand into the filter thread of a 2″ eyepiece, diagonal or nosepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it for visual use or imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBoth. SVBONY presents it for visual observing and astrophotography.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I choose 2″ or 1.25″?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eChoose 2″ if you use 2″ eyepieces or a 2″ diagonal, or image with a sensor large enough that a 1.25″ filter would vignette.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ UHC filter that darkens light-polluted skies and lifts emission and planetary nebulae, for wide-field visual observing and 2″ imaging trains.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"2″","offer_id":67722207789167,"sku":"F9131B","price":61.28,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9131b-1_20250807111141_9843--1-_20260810104404_3573.webp?v=1791670034"}],"url":"https:\/\/ontariotelescope.com\/collections\/light-pollution-filters-svbony.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}