{"product_id":"optolong-l-quad-enhance-filter","title":"Optolong L-Quad Enhance Filter","description":"\n\u003cul class=\"DAV-feature-list\"\u003e\n    \u003cli\u003e\n        Versatile light pollution suppression\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Quad-bandpass design\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Isolates key emission lines for nebulae and galaxies\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Provides higher contrast and better color balance\n    \u003c\/li\u003e\n        \u003cli\u003e\n       Reduces star halos and bloat\n    \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\u003eSpecifications\u003c\/li\u003e\n    \u003cli\u003eIn the Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n    \u003cli class=\"active\"\u003e       \n        \u003cdiv\u003e\n            \u003c!-- Title image text --\u003e\n            \u003cdiv class=\"DAV-bg-light\"\u003e\n                \u003c!-- Main Image --\u003e\n                \u003cdiv class=\"DAV-section-center\"\u003e\n                    \u003ch2\u003eOptolong L-Quad Enhance Filter Overview\u003c\/h2\u003e\n                    \u003cp\u003eThe Optolong L-Quad Enhance Filter (L-QEF) is a high-performance quad-bandpass filter engineered for astrophotographers using color cameras. It is designed to suppress light pollution from sources like mercury and sodium lamps while allowing key emission lines from celestial objects to pass through. This filter effectively enhances the contrast and details of deep-sky targets, including nebulae, galaxies, and star clusters, making it an excellent tool for astrophotography from light-polluted urban and suburban areas.\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- image text --\u003e\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eVersatile Quad-Bandpass Performance\u003c\/h3\u003e                \n                    \u003cp\u003e\n                        Unlike many narrowband filters, the L-Quad Enhance captures signals from four key emission lines in a single exposure when paired with a color camera: H-beta, OIII, H-alpha, and SII. This maximizes the signal from a wide variety of targets, including both emission and reflection nebulae, as well as star clusters and galaxies. This broad coverage makes it an ideal all-around filter for photographers seeking to save time and simplify their setup while achieving stunning results.     \n                    \u003c\/p\u003e\n                                    \n                \u003c\/div\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-comparison.jpg?v=1756067242\" alt=\"Optolong L-Pro comparison\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n\n                        \u003c!-- image text --\u003e\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eL-Quad Enhance vs. L-Pro\u003c\/h3\u003e                \n                    \u003cp\u003e\n                       The L-Quad Enhance represents an evolution of its popular predecessor, the L-Pro. While the L-Pro is an excellent light pollution filter, the L-QEF offers key improvements for superior performance: \n                    \u003c\/p\u003e  \n                    \n                    \u003cul\u003e\n                        \u003cli\u003eBetter Color Balance – The L-QEF provides more naturally balanced color channels, reducing the strong green cast often seen with the L-Pro.\u003c\/li\u003e\n                            \u003cli\u003eHigher Contrast – It offers a visibly higher contrast and a more even background, making faint details stand out more clearly.\u003c\/li\u003e\n                                \u003cli\u003eImproved Star Performance – The L-QEF is better at handling bright stars, effectively suppressing halos and starbursts for a cleaner final image.\u003c\/li\u003e\n                                    \u003cli\u003eSuperior Infrared Blocking – The L-QEF filters infrared light more correctly, leading to less noise and a cleaner image.\u003c\/li\u003e\n                    \n                    \u003c\/ul\u003e\n                \u003c\/div\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-Transmission-Graph.png?v=1756067243\" alt=\"Optolong L-Pro transmission graph\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eUV and IR Blocking\u003c\/h3\u003e                \n                    \u003cp\u003e\n                       The L-Quad Enhance filter's design includes a near-infrared (IR) cut-off up to 1000nm. This feature reduces IR noise and helps ensure that extraneous light from both ends of the visible spectrum does not interfere with the final image, simplifying your imaging workflow.    \n                    \u003c\/p\u003e           \n                \u003c\/div\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-on-Eyepiece.png?v=1756067242\" alt=\"L-Pro filter installed on eyepiece\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n        \u003c\/div\u003e\n    \u003c\/li\u003e\n\n\n\n\n    \u003cli\u003e\n          \u003ctable class=\"DAV-specifications\"\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eMaterial\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eSchott optical glass\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eThickness\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e1.85mm\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                                                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFilter Cell Height\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e4.8mm without male thread, 6.8mm with thread\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eSurface Quality\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eOptical Polish\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt; 30 seconds parallelism\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eTransmission\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eHigh transmission at H-beta, OIII, H-alpha and SII emission lines\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eBlocking\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eOD2-OD4 (300-1000nm), blocking all major artificial light pollution lines\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/li\u003e\n    \n\n    \u003cli\u003e\n        \u003cul class=\"DAV-grid\"\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-2inch__58386.1612893783.1280.1280_dd518ef8-57b9-43a5-ac1c-d450992a2b0a.jpg?v=1698452919\" alt=\"L-Pro Filter\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eL-Quad Enhance filter\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                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-Filter-Case.png?v=1756067596\" alt=\"Plastic Filter Case\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003ePlastic Filter 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!-- Add more items as needed --\u003e\n        \u003c\/ul\u003e          \n    \u003c\/li\u003e\n    \n\n\u003c\/ul\u003e\n","brand":"Optolong","offers":[{"title":"2\" Mounted","offer_id":50289892688157,"sku":"OPT-14702","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Quad-Enhance-Filter.jpg?v=1756170392","url":"https:\/\/davidastro.com\/fr-us\/products\/optolong-l-quad-enhance-filter","provider":"David Astro","version":"1.0","type":"link"}