{"product_id":"svbony-sv115-18nm-1-25-o-iii-filter-narrowband-cuts-light-pollution-filter-for-astronomy-telescope","title":"SVBONY SV115 18nm 1.25 O-III Filter Narrowband Cuts Light Pollution Filter for Astronomy Telescope\"","description":"\u003cdiv id=\"specification\"\u003e\u003c\/div\u003e\u003cdiv id=\"specification_end\"\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cspan style=\"font-size: 18px; font-weight: 700;\"\u003eDescription:\u003c\/span\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\n\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003eNarrowband OIII filter is designed for nebula observation allowing 18nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including Hg vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 18px; font-weight: 700;\"\u003eFeatures:\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e1. Filter substrate is fine-optically polished to 1\/4 wave and \u0026lt;30 parallelism over both surfaces.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e2. Suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e3. Suitable for viewing on bright nebulae like M42 Orion Nebula in heavy light pollution.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e4. Use with a large aperture telescope under clear and dark viewing conditions with good seeing.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e5. Narrowband filter do not eliminate the effects of light pollution or increase the object?™s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e6. Thin metal cells have a clear aperture of 26mm for 1.25' filters\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e7. Each filter comes with a plastic case with high pressure EVA case lining\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size: 18px; font-weight: 700;\"\u003eSpecifications:\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e1. Blocking area: 400-700nm\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e2. Transmittance: 90% at 495.9nm and 500.7nm\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e3. FWHM: 18±2nm\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e4. Thickness: 1.85mm\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e5. Surface quality: 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e6. Diameter: 1.25 inch\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e7. Weight: 5.4g\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cb\u003eNote:\u003c\/b\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003eThe filter is not suitable for direct sunlight. Do not use this filter to look at the sun. If you fail to follow the warning, you will be blind.\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 18px; font-weight: 700;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 18px; font-weight: 700;\"\u003ePackage Includes:\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e1 x SV115 O-III 1.25' filter\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cspan style=\"font-size: 18px; font-weight: 700;\"\u003eDetails Picture:\u003c\/span\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/4A\/F6\/2a7ecd87-0caf-4dcb-9df0-6630f7d747a2.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/A4\/B0\/e239faec-79c3-4343-a3e3-bd3ab3d264e9.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/03\/D4\/45ac03c7-71f5-42c0-b972-63052f00f8bd.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/08\/4A\/9a652a7d-32f2-43a6-a9b7-2ef3b5c83065.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/51\/7A\/1799f7f8-bf44-464b-8015-77c04952a126.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/FD\/D6\/e316ec15-4ccc-4907-add4-9746761b2702.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/E2\/C3\/b6f6fd10-ee20-4409-920e-1de3a9df86ee.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"http:\/\/imgmgr.banggood.com\/images\/oaupload\/banggood\/images\/5D\/2C\/8e765778-549c-48cb-90c9-aae7ec801c8a.jpg\" style=\"width:1000px\"\u003e\u003c\/p\u003e","brand":"Electronic Pro","offers":[{"title":"Default Title","offer_id":40704678133955,"sku":"1842644","price":2687.07,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2787\/9162\/products\/2a7ecd87-0caf-4dcb-9df0-6630f7d747a2.jpg?v=1631870375","url":"https:\/\/www.electronicpro.co.za\/products\/svbony-sv115-18nm-1-25-o-iii-filter-narrowband-cuts-light-pollution-filter-for-astronomy-telescope","provider":"Electronic Pro ","version":"1.0","type":"link"}