{"product_id":"optolong-l-extreme-f2-dual-band-filter-for-fast-optics-2","title":"Optolong  L-eXtreme F2 7nm Dual Band Filter for Fast Optics - 2\"","description":"\u003cp\u003eThe Optolong L-eXtreme F2 is a dual-band (500.7 nm and 656.28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterized spectral lines (OIII, Ha) are the main transmission wavelengths, and the OIII and H-Alpha nebula emission lines pass accurately at f2 - f3.3.  This 2\" L-eXtreme filter performs well with RASA, HyperStar F2 and other telescopes with fast optics of f\/2 to f\/3.3.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eKey Features:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eTogether with one-shot color astronomical cameras, monochrome astronomical cameras, and Digital SLR cameras, you can quickly obtain clear and detailed images of the deep sky;\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eIdeal for fast optical systems, like the Celestron RASA, Hyperstar, and other fast focal ratio telescope users;\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAnti-light pollution, better contrast, more details in celestial objects: This filter cuts out background light and noise beyond the target objects to get better details and contrast in your images. L-eXtreme F2 can effectively block light pollution so that the images will not be affected by unwanted lighting or sky glow if the background. You can quickly get satisfactory pictures with fast optical systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSubstrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eoptical glass\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.85mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eOIII 7nm \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHa 7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBlocking range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e300-1000nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBlocking Depth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u0026gt;OD4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSurface quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e60\/40\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTransmitted Wavefront RMS\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eλ\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e Parallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e30s\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":40248867455089,"sku":"OPTO-L-EXTREME-F2","price":299.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/L-Extreme_F2_2inch.jpg?v=1776459200","url":"https:\/\/khanscope.com\/en-fr\/products\/optolong-l-extreme-f2-dual-band-filter-for-fast-optics-2","provider":"Khan Scope Centre","version":"1.0","type":"link"}