{"id":29069,"date":"2025-09-20T20:06:11","date_gmt":"2025-09-20T18:06:11","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=29069"},"modified":"2026-03-13T11:43:31","modified_gmt":"2026-03-13T10:43:31","slug":"optolong-h-alpha-filter-3nm-2-inch","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/optolong-h-alpha-filter-3nm-2-inch\/","title":{"rendered":"Optolong H-alpha Filter 3nm 2 inch"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Optolong Filters H-alpha 3nm 2\u2033 is a professional narrowband filter that passes only the H-alpha emission line (656.3 nm) with an extremely narrow bandwidth of 3 nm. This captures hydrogen-rich nebulae such as the Rosette Nebula, the North American Nebula and the Orion Nebula with exceptional detail and contrast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thanks to its ultra-slim pass-through, the filter effectively blocks virtually all other light, including disturbing emissions from artificial light and influences from moonlight. This makes it possible to take deep shots with a high signal-to-noise ratio even from highly light-polluted areas or during moonlit nights.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The filter is made of high-quality optical glass with multiple anti-reflection coatings that minimize reflections and halos. The robust 2\u2033 aluminum mount makes it suitable for use in filter wheels and 2\u2033 adapters. The filter works optimally with monochrome astro cameras, but can also be used with modified DSLRs and color cameras to isolate H-alpha details.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Application<\/strong><br>This filter is ideal for serious astrophotographers who want to capture emission nebulae with the highest possible contrast and detail. It works best with monochrome cameras in combination with other narrowband filters (OIII and SII) for complete narrowband shots. For visual use, this filter is unsuitable because the bandwidth is too narrow for the human eye.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Specifications<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type: H-alpha narrowband filter<\/li>\n\n\n\n<li>Bandwidth: 3 nm around 656.3 nm<\/li>\n\n\n\n<li>Diameter: 2\u2033 mount<\/li>\n\n\n\n<li>Material: Optical glass with multiple anti-reflection coating<\/li>\n\n\n\n<li>Mount: Aluminum<\/li>\n\n\n\n<li>Application:\n<ul class=\"wp-block-list\">\n<li>\u2713 Astrophotography of emission nebulae<\/li>\n\n\n\n<li>\u2713 High contrasts in heavy light pollution and moonlight<\/li>\n\n\n\n<li>\u2713 Ideal for use with monochrome cameras<\/li>\n\n\n\n<li>\u2717 Not suitable for visual use<\/li>\n<\/ul>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<article class=\"w-full text-token-text-primary focus-visible:outline-2 focus-visible:outline-offset-[-4px]\" dir=\"auto\" data-testid=\"conversation-turn-35\" data-scroll-anchor=\"true\">\n<div class=\"text-base my-auto mx-auto py-[18px] px-6\">\n<div class=\"mx-auto flex flex-1 text-base gap-4 md:gap-5 lg:gap-6 md:max-w-3xl lg:max-w-[40rem] xl:max-w-[48rem]\">\n<div class=\"group\/conversation-turn relative flex w-full min-w-0 flex-col agent-turn @xs\/thread:px-0 @sm\/thread:px-1.5 @md\/thread:px-4\">\n<div class=\"flex-col gap-1 md:gap-3\">\n<div class=\"flex max-w-full flex-col flex-grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 whitespace-normal break-words text-start [.text-message+&amp;]:mt-5\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"28a009d2-3136-4224-8ee5-30c9a1a2ece5\" data-message-model-slug=\"gpt-4o\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[3px]\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\n<p data-start=\"344\" data-end=\"695\">\u00a0<\/p>\n<p data-start=\"144\" data-end=\"342\">Optolong Filters H-alpha 3nm 2&#8243; wordt geleverd met aluminium vatting en ultra-smalle 3 nm doorlaat \u2013 hoogwaardig smalbandfilter voor emissienevels met maximale contrasten.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"featured_media":29074,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1548],"product_cat":[56,587,588,3138],"product_tag":[],"class_list":["post-29069","product","type-product","status-publish","has-post-thumbnail","product_brand-optolong","product_cat-telescoop-accessoires","product_cat-camera-accessoires","product_cat-filters","product_cat-imaging-filters-smalband-en-lrgb","product_shipping_class-licht","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"bundled_by":[],"bundle_stock_status":"instock","bundle_stock_quantity":null,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":29117,"url":"https:\/\/staging.telescoop.nl\/en\/optolong-sho-filter-kit-3nm-2-inch\/","url_meta":{"origin":29069,"position":0},"title":"Optolong SHO Filter Kit 3nm 2 inch","author":"","date":"22-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters SHO 3nm 2\" comes with a set of high-quality narrowband filters (H-alpha, OIII, and SII) for colorful nebula shots in the Hubble palette.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters SHO 3nm 2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":29141,"url":"https:\/\/staging.telescoop.nl\/en\/optolong-sho-filter-kit-3nm-36mm\/","url_meta":{"origin":29069,"position":1},"title":"Optolong SHO Filter Kit 3nm 36mm","author":"","date":"22-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters SHO 3nm 36mm comes with a complete set of narrowband filters (H-alpha, OIII and SII) for astrophotography in the Hubble palette.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters SHO 3nm 36mm","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=1400%2C800&ssl=1 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pollution.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters L-Ultimate 2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=1050%2C600&ssl=1 3x, 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