{"id":29075,"date":"2025-09-20T20:08:54","date_gmt":"2025-09-20T18:08:54","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=29075"},"modified":"2026-03-13T11:42:58","modified_gmt":"2026-03-13T10:42:58","slug":"optolong-h-alpha-filter-7nm-1-25-inches","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/optolong-h-alpha-filter-7nm-1-25-inch\/","title":{"rendered":"Optolong H-alpha Filter 7nm 1.25 inches"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Optolong Filters H-alpha 7nm 1.25\u2033 is a high-quality narrowband filter that passes only the H-alpha emission line (656.3 nm) with a bandwidth of 7 nm. This isolates red light from hydrogen-rich nebulae, while effectively blocking interfering wavelengths such as those from sodium and mercury lamps. The result is a darker sky background and more contrast, even in urban areas with high light pollution.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This filter captures emission nebulae such as the Orion Nebula, the Rosette Nebula and the North American Nebula with great detail. Thanks to its wider bandwidth of 7 nm, compared to ultra-small filters of 3 nm, this filter is less critical in terms of optical setup and therefore also suitable for use with telescopes with a relatively short focal ratio. The filter is made of high-quality optical glass and features multiple anti-reflection coatings for maximum light transmission and minimal reflections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The rugged 1.25\u2033 aluminum mount makes the filter suitable for virtually all standard eyepieces, filter wheels and adapters. Although the filter is primarily intended for astrophotography, it can also provide limited visual effect in bright nebulae in medium-sized telescopes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Application<\/strong><br>This filter is ideal for astrophotographers who want to capture emission nebulae with color cameras, modified DSLRs or monochrome cameras. It offers an excellent balance between high contrast and broad applicability. For visual use, the added value remains limited, but in photography it delivers marked improvements even under moonlight or urban skies.<\/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: 7 nm around 656.3 nm<\/li>\n\n\n\n<li>Diameter: 1.25\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 Suitable for color cameras, DSLRs and mono cameras<\/li>\n\n\n\n<li>\u2713 Effective under light pollution and moonlight<\/li>\n\n\n\n<li>\u2717 Limited suitability 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=\"360\" data-end=\"825\">\u00a0<\/p>\n<p data-start=\"150\" data-end=\"358\">Optolong Filters H-alpha 7nm 1,25&#8243; wordt geleverd met aluminium vatting en 7 nm bandbreedte \u2013 smalbandfilter voor contrastrijke nevel-astrofotografie vanuit lichtvervuilde gebieden.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"featured_media":29082,"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-29075","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":29084,"url":"https:\/\/staging.telescoop.nl\/en\/optolong-h-alpha-filter-7nm-2-inch\/","url_meta":{"origin":29075,"position":0},"title":"Optolong H-alpha Filter 7nm 2 inch","author":"","date":"20-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters H-alpha 7nm 2\" wordt geleverd met aluminium vatting en 7 nm bandbreedte \u2013 smalbandfilter voor astrofotografie van emissienevels met 2\" accessoires.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters H-alpha 7nm 2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-7nm-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-H-alpha-7nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-7nm-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-7nm-2-.jpg?resize=700%2C400&ssl=1 2x, 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2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-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-Filter-Kit-7nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=1400%2C800&ssl=1 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maximum contrast.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters H-alpha 3nm 2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-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-H-alpha-3nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-3nm-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-3nm-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-3nm-2-.jpg?resize=1050%2C600&ssl=1 3x, 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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, 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