{"product_id":"optolong-moon-skyglow-filter","title":"OPTOLONG  Moon and Skyglow Filter","description":"\u003cp\u003eMoon \u0026amp; Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow 589nm and many street light emissions from artificial light. Its high efficiency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters.\u003cbr\u003e \u003cbr\u003e\u003cstrong\u003eMoon \u0026amp; Skyglow Introduction\u003c\/strong\u003e\u003cbr\u003eOptolong Moon \u0026amp; Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow 589nm and many street light emissions from artificial light. Its high efficiency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003cbr\u003eIdeally it is quite versatile filter for visual observation and astrophotography on planetary nebula.\u003cbr\u003e \u003cbr\u003e\u003cstrong\u003eWARNING\u003c\/strong\u003e\u003cbr\u003eThe filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003cbr\u003e \u003cbr\u003e\u003cstrong\u003eMoon \u0026amp; Skyglow Characteristic\u003c\/strong\u003e\u003cbr\u003eSbustrate: B270\u003cbr\u003eThickness: 1.85mm\u003cbr\u003eTave: T\u0026gt;90%\u003cbr\u003eBlocking range: 350-1050nm\u003cbr\u003eBlcoking depth: light pollution line blocking \u0026gt;99%\u003cbr\u003eSurface quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism: 30s\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003cbr\u003eThe horizontal axis is the Wavelength in Nanometers(nm).\u003cbr\u003eThe vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCOATING TECHNOLOGY\u003c\/strong\u003e\u003cbr\u003eMulti-layers anti-reflection coating\u003cbr\u003eNon-cementing optical substrate coating\u003cbr\u003eOptolong L-Pro filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003cbr\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003cbr\u003e \u003c\/p\u003e","brand":"OPTOLONG","offers":[{"title":"1.25 inch","offer_id":42588909731901,"sku":null,"price":3115.0,"currency_code":"INR","in_stock":true},{"title":"2 inch","offer_id":42588909764669,"sku":null,"price":4600.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/6595\/8205\/files\/moon_and_skyglow-2.jpg?v=1757848618","url":"https:\/\/moderntelescopes.net\/products\/optolong-moon-skyglow-filter","provider":"Modern Telescopes","version":"1.0","type":"link"}