{"product_id":"svbony-sv220-dual-band-3nm-h-alpha-oiii-filter-1-25-mounted-w9198a","title":"SVBONY SV220 Dual Band 3nm H-Alpha \u0026 OIII Filter 1.25\" Mounted | W9198A","description":"\u003cp\u003eThis 3nm dual narrowband (H-Alpha + OIII) filter features an ultra-narrow FWHM bandwidth of only 3±1nm, which efficiently filters out background stray light. Combined with a wide cutoff wavelength range of 300-1050nm (covering ultraviolet to near-infrared spectra) and an average OD5 transmittance as low as 0.001%, it strongly suppresses light pollution and stray light, significantly improving the signal-to-noise ratio (SNR). Meanwhile, its high transmittance performance of over 85% greatly reduces exposure requirements. Even in heavily light-polluted urban environments, it enables fast capture of deep-sky objects. In addition, it adopts multi-layer minimal halo coating design, which effectively reduces glare and halo interference, enhances image contrast and color accuracy, improves the purity of deep-sky photography images.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-1_20250828164203_8293.jpg?v=1769704075\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-2_20250828164216_5982.jpg?v=1769704075\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-3_20250828164237_5512.jpg?v=1769704076\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-4_20250828164246_0236.jpg?v=1769704076\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-5_20250828164253_9868.jpg?v=1769704076\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-6_20250828164301_3533.jpg?v=1769704076\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-7_20250828164308_6046.jpg?v=1769704076\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-8_20250828164329_6732.jpg?v=1769704076\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/w9198a-9_20250828164340_4707.jpg?v=1769704076\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eProduct specification\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e1.25 inches\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eMirror ring size\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eΦ31.75x7mm\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eThread Type\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eSingle Thread\/Male Thread\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eThread Specifications\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eM28.5*0.6\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eMaterial\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e6061T aluminum profile\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eSubstrate Thickness\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e2.0 mm\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eAperture of light transmission\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e26mm\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eCenter Wavelength\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e500.7\/656.3 nm\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eBandwidth\/FWHM\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e3±1nm\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eCutoff wavelength\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e300-1050nm\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eCut-off depth\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eaverage OD5\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eSurface quality\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e60\/40\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eSurface flatness\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003etransmitted wave front PV≤λ\/4a\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eParallelism\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e30″\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003eNet weight\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cdiv\u003e\u003cspan\u003e7g\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Svbony","offers":[{"title":"Default Title","offer_id":48714602742012,"sku":"W9198A","price":172.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Untitled_design_5.png?v=1769704324","url":"https:\/\/all-startelescope.com\/fr\/products\/svbony-sv220-dual-band-3nm-h-alpha-oiii-filter-1-25-mounted-w9198a","provider":"All-Star Telescope Canada","version":"1.0","type":"link"}