{"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","url":"https:\/\/davidastro.com\/fr\/products\/svbony-sv115-18nm-oiii-narrowband-filter","provider":"David Astro","version":"1.0","type":"link"}