{"product_id":"explore-scientific-310140","title":"Explore Scientific Nebula Filter H-Alpha 2-inch 7nm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e7nm H-Alpha Bandpass\u003c\/li\u003e\n\u003cli\u003e2-inch Filter Format\u003c\/li\u003e\n\u003cli\u003eIsolates Hydrogen Emission Nebulae\u003c\/li\u003e\n\u003cli\u003eBlocks Urban Light Pollution\u003c\/li\u003e\n\u003cli\u003eIncludes Individual Test Report\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\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific Nebula Filter H-Alpha 2-inch 7nm\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific H-Alpha 2-inch Nebula Filter isolates the specific wavelength of hydrogen emission nebulae within a tight 7nm bandpass, making it an essential tool for urban astrophotography. By aggressively rejecting light pollution from mercury and sodium vapor lamps, this 2-inch filter reveals faint, extended structures that are otherwise completely lost against a brightened sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 7nm Bandpass for Maximum Nebula Contrast\u003c\/h3\u003e\n\u003cp\u003eThis filter's narrow 7nm window is engineered to transmit only the red light associated with ionized hydrogen, the primary element in most emission nebulae. By blocking all other wavelengths, the filter dramatically darkens the sky background, causing the faint signal from your target to stand out with striking contrast. Photos taken with the filter reveal details in objects like the North American Nebula (NGC 7000) that appear completely empty without it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUrban Astrophotography with a 2-inch H-Alpha Filter\u003c\/h3\u003e\n\u003cp\u003eLight pollution is the single greatest challenge for deep-sky imagers. The Explore Scientific 7nm H-Alpha filter is designed specifically to solve this problem, enabling high-quality astrophotography from city and suburban locations. It effectively nullifies the glow from common streetlights, transforming a washed-out sky into a dark canvas and making surprisingly deep images possible despite local light pollution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIndividually Tested for Guaranteed 7nm Performance\u003c\/h3\u003e\n\u003cp\u003eTo ensure you receive a high-quality optical component, every Explore Scientific nebula filter is supplied with an individual test report. This certification verifies that your specific filter meets its stated transmission and bandpass specifications. This commitment to quality control guarantees that you are capturing the maximum amount of signal from your target while effectively blocking unwanted light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e7nm H-Alpha vs. Broadband LPR Filters: Choosing the Right Tool\u003c\/h3\u003e\n\u003cp\u003eWhile both filter types combat light pollution, they serve different purposes. A broadband Light Pollution Reduction (LPR) filter is a general-purpose tool that passes a wide range of wavelengths, making it suitable for galaxies and star clusters. This 7nm H-Alpha filter is a specialist's instrument with a much narrower bandpass.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eH-Alpha 7nm Filter:\u003c\/strong\u003e Exclusively for emission nebulae. It provides the highest possible contrast but will block almost all light from broadband targets like the Andromeda Galaxy (M31) or reflection nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroadband LPR Filter:\u003c\/strong\u003e A jack-of-all-trades filter that provides a modest contrast boost on all deep-sky objects but cannot match the dramatic effect of a narrowband filter on emission nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary use for the Explore Scientific 7nm H-Alpha filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter is designed exclusively for \u003cstrong\u003eastrophotography of emission nebulae\u003c\/strong\u003e. Its narrow 7nm bandpass isolates the hydrogen-alpha wavelength, dramatically increasing contrast and revealing faint details, especially from light-polluted locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Explore Scientific 7nm H-Alpha filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is not recommended for visual use. The 7nm bandpass is so restrictive that it blocks too much light for the human eye to perceive a useful image. It is specifically engineered for long-exposure imaging with a digital camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 7nm bandpass on this H-Alpha filter help with light pollution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLight pollution from sources like mercury and sodium vapor streetlights is \"broadband,\" meaning it emits light across many colors. The \u003cstrong\u003e7nm H-Alpha filter\u003c\/strong\u003e blocks all of these colors except for a very narrow 7nm-wide slice of red light where emission nebulae shine. This effectively removes the skyglow from your images, resulting in a much darker background and higher contrast on your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 2-inch H-Alpha filter improve my images of the Orion Nebula (M42) from my backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The Orion Nebula (M42) is a massive hydrogen-alpha region. Using this 7nm filter will cut through local light pollution to reveal the faint outer loops and intricate details in the nebula's core that are typically washed out in unfiltered images from a suburban or urban setting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have an 8\" SCT with a 2-inch focuser. Is this Explore Scientific H-Alpha filter the right size?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e2-inch format\u003c\/strong\u003e is ideal for an 8\" SCT or any telescope equipped with a 2-inch focuser and accessories. It will thread directly into your 2-inch diagonal, filter wheel, or camera nosepiece, ensuring it won't cause any vignetting, even with larger camera sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the included individual test report for the Explore Scientific H-Alpha filter tell me?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe test report is your assurance of optical quality. It provides a graph showing the exact transmission curve for your specific filter, verifying that it meets the \u003cstrong\u003e7nm bandpass\u003c\/strong\u003e specification and is centered on the correct H-Alpha wavelength. This guarantees you are getting the performance needed for high-contrast imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eH-Alpha Narrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eAstrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eNebula Filter H-Alpha 2-inch 7nm\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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eIndividual Test Report\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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective 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\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNo manual or software is available for this product.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52909393084701,"sku":"ES-310140","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-Nebula-Filter-H-Alpha-2-inch-7nm-1_3d94e10c-d601-4b61-ae25-d00467474e73.jpg?v=1789061575","url":"https:\/\/davidastro.com\/fr-us\/products\/explore-scientific-310140","provider":"David Astro","version":"1.0","type":"link"}