{"product_id":"1-25-l-extreme-deep-sky-light-pollution-filter","title":"1.25\" L-eXtreme Deep-Sky Light Pollution Filter","description":"\u003cp\u003eThe L-eXtreme is a two-band filter and the ideal choice for strong suppression of light pollution. It enables astrophotos of objects with narrow-band emissions in the O-III and H-alpha lines out of the city.\u003c\/p\u003e\n\u003c!--start tab--\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional photographic filter for astronomy\u003c\/li\u003e\n\u003cli\u003eEnhances the photographs of emission nebulae in the city\u003c\/li\u003e\n\u003cli\u003eIdeal for extreme suppression of light pollution\u003c\/li\u003e\n\u003cli\u003eAllows astrophotography even from bright cities\u003c\/li\u003e\n\u003cli\u003eDual-band filter with high transmission for O-III + H-alpha\u003c\/li\u003e\n\u003cli\u003eDoes not require extremely expensive, but powerful telescopes\u003c\/li\u003e\n\u003cli\u003eCMOS color cameras deliver image quality like CCD mono cameras\u003c\/li\u003e\n\u003cli\u003e7nm narrow dual bandpass filter for one-shot color cameras\u003c\/li\u003e\n\u003cli\u003eDiam. 2.0 inch \/ 50.8mm, connection thread: M48x0.75mm\u003c\/li\u003e\n\u003cli\u003eMultiple anti-reflective coatings for maximum contrast\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!--end tab--\u003e\u003c!--start tab--\u003e\n\u003cp\u003e\u003cstrong\u003eL-eXtreme filter for deep-sky fog photography out of the city\u003c\/strong\u003e \u003cbr\u003eThe steady expansion of cities and the associated light pollution have become a growing problem for all astrophotographers. Common solutions to this can be expensive and include the purchase of a monochrome camera, various types of narrowband filters, and a filter wheel. Especially with inexpensive but powerful Newtonian telescopes, two-lens ED refractors or even achromatic lenses, the L-eXtreme filters open up completely new possibilities for taking high-quality astronomical images even within light-polluted cities. CMOS cameras can thus deliver images like monochrome cameras. This new generation of filters enables amazing astrophotos directly from the heavily light-polluted city with all its artificial light sources. The double narrow bandpass for the wavelengths of O-III and H-alpha and the almost complete attenuation of the interfering light sources by these new filters make them an ideal solution.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eL-eXtreme description\u003c\/strong\u003e\u003cbr\u003eL-eXtreme is a 7nm narrow dual bandpass filter that can be used with one-shot color cameras such as DSLRs (digital single-lens reflex cameras), color CMOS and monochrome CCD cameras. The simplicity and cost-effectiveness of this filter allows amateurs to image the faintly glowing emission nebulae, even in bright, heavily light-polluted skies. The L-eXtreme filter is the better choice for fast optical systems at a competitive price. The filter isolates the H-Alpha and O-III emission lines from nebulae so that the contrast and signal-to-noise ratio between the nebula and the background are maximized. The design of our L-eXtreme filter is a technical innovation among filters. For astronomers who live in heavily light-polluted areas.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain application and performance\u003c\/strong\u003e\u003cbr\u003eThis new generation of filters enables amazing astrophotos directly in the light-polluted city with all its artificial light sources. The narrow bandpass for the wavelengths of O-III and H-alpha and the almost complete attenuation of the interfering light sources do not require very large or extremely expensive telescopes. No, especially with inexpensive but powerful Newtonian telescopes, double-lens ED refractors or even achromatic lenses, these filters open up completely new possibilities for recording high-quality astronomical images. In addition, with the help of these filters, CMOS color cameras can deliver an image quality that approaches that of CCD monochrome cameras.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e \u003cem\u003eThese nebulae filters are not suitable for solar observation. DO NOT LOOK AT THE SUN WITH THIS FILTER. You will go BLIND if you don't heed this warning. \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCoating technology\u003c\/strong\u003e\u003cbr\u003eMulti-layer anti-reflective coating of the optical substrate. The L-eXtreme filter uses a precision coating based on ion-assisted deposition coating technology to ensure durability and scratch resistance, as well as stability on CWL (central wavelength) that is not affected by temperature changes. Absolute precision and homogeneity of the coatings as well as maximum values for the transmission in the passband and the optical density in the off-band area are guaranteed for all filters.\u003c\/p\u003e\n\u003c!--end tab--\u003e\u003c!--start tab--\u003e\n\u003ctable\u003e\n\u003ccolgroup\u003e \u003ccol\u003e \u003c\/colgroup\u003e\n\u003cthead\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem Number\u003c\/td\u003e\n\u003ctd\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e310175\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter diameter\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.25 inches \/ 31.75 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection thread\u003c\/td\u003e\n\u003ctd\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eM48x0.75mm\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpectrum\u003c\/td\u003e\n\u003ctd\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e300-1000nm Off-band blocking:\u0026gt; 99%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface quality\u003c\/td\u003e\n\u003ctd\u003e60\/40 (see MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e15g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!--end tab--\u003e\u003c!--start tab--\u003e\n\u003cp style=\"font-size: 16px;\"\u003e \u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":51270921879837,"sku":"310175","price":239.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0059\/0158\/2449\/files\/310175_1.jpg?v=1778528679","url":"https:\/\/stemcell.eco\/products\/1-25-l-extreme-deep-sky-light-pollution-filter","provider":"Stemcell Science Shop","version":"1.0","type":"link"}