{"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","url":"https:\/\/davidastro.com\/fr\/products\/svbony-sv132-25nm-h-beta-narrowband-filter","provider":"David Astro","version":"1.0","type":"link"}