{"id":113385,"date":"2026-10-09T16:55:20","date_gmt":"2026-10-09T14:55:20","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=113385"},"modified":"2026-10-13T11:14:22","modified_gmt":"2026-10-13T09:14:22","slug":"optolong-h-beta-nevelfilter-12-nm-125-inch-for-the-horse-head-fog","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/optolong-h-beta-nevelfilter-12-nm-125-inch-voor-de-paardenkopnevel\/","title":{"rendered":"Optolong H-Beta new filter 12 nm 1.25 inch for the Horsehead Nebula"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The Orion Horsehead Nebula is visually a difficult object because it mainly emits light in a single line of hydrogen: the H-beta line. This filter, the Optolong H-beta 1.25 inch, lets a band of 12 nm through that line and blocks most of the other light. This makes such nebulae more visible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You screw the filter into an eyepiece or diagonal mirror with 1.25 inch filter thread. In addition to the Horsehead Nebula, the California Nebula in Perseus becomes clearer as well. If you use 2 inch eyepieces, then there is <a href=\"https:\/\/www.telescoop.nl\/en\/optolong-h-beta-nevelfilter-12-nm-2-inch-for-visual-observation-of-clouds\/\">same H-beta in 2 inch<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An H-beta filter works well only with a handful of nebulae and makes everything else darker. It works best with a telescope with a large aperture under a dark sky, such as the <a href=\"https:\/\/www.telescoop.nl\/en\/telescopes\/dobsonian-telescopes\/classic-dobson\/\">Classic Dobson telescopes<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you are looking for a general-purpose filter for fog, then look at an UHC or O-III filter first. <a href=\"https:\/\/www.telescoop.nl\/en\/telescope-accessories\/deep-sky-filters\/\">Filters for deep-sky observations<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>12 nm H-beta filter in 1.25 inch to better see visually faint nebulae such as the Horsehead Nebula and the California Nebula.<\/p>","protected":false},"featured_media":113383,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1548],"product_cat":[3137,56],"product_tag":[],"class_list":["post-113385","product","type-product","status-publish","has-post-thumbnail","product_brand-optolong","product_cat-deep-sky-filters","product_cat-telescoop-accessoires","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":113386,"url":"https:\/\/www.telescoop.nl\/en\/optolong-h-beta-nevelfilter-12-nm-2-inch-voor-visueel-waarnemen-van-nevels\/","url_meta":{"origin":113385,"position":0},"title":"Optolong H-Beta nanofilter 12 nm 2 inch for visual observation of fog","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"12 nm H-beta filter in 2 inches, for visual observation of clouds that mainly radiate in the H-beta line of hydrogen.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/87863_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/87863_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/87863_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":107494,"url":"https:\/\/www.telescoop.nl\/en\/televue-bandmate-type-2-h-beta-125-lijnfilter\/","url_meta":{"origin":113385,"position":1},"title":"TeleVue Bandmate Type 2 H-Beta 1.25\" \u2013 Line Filter","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"Baader Planetarium Type 2 H-beta filter 1.25 inch for the Horsehead Nebula and related targets.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Filters Filter H-Beta Bandmate Type 2 1,25\" zwart 1,25 inch H-Beta filter met groene glaslaag en TeleVue Bandmate Type 2 opdruk op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-Type-2-1-25-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-Type-2-1-25-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-Type-2-1-25-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-Type-2-1-25-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":107506,"url":"https:\/\/www.telescoop.nl\/en\/televue-bandmate-type-2-h-beta-2-lijnfilter\/","url_meta":{"origin":113385,"position":2},"title":"TeleVue Bandmate Type 2 H-Beta 2\" - Line Filter","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"Bandmate Type 2 H-beta filter for extended hydrogen nebulae.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Filters Filter H-Beta, Bandmate type 2, 2\" zwart 2 inch H-Beta filter met groen gecoat glas en Bandmate Type 2 opdruk op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-type-2-2-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-type-2-2-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-type-2-2-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-H-Beta-Bandmate-type-2-2-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":25230,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-h-beta-filter-125\/","url_meta":{"origin":113385,"position":3},"title":"Omegon Pro H-Beta 1.25\" Filter","author":"","date":"07-08-2025","format":false,"excerpt":"Specialized H-beta filter around 486 nm that brings objects like the Horsehead Nebula and California Nebula within reach. For experienced observers with a large telescope.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Omegon Pro H-Beta Filter 1,25\"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":107498,"url":"https:\/\/www.telescoop.nl\/en\/televue-nebustar-uhc-125-uhc-filter\/","url_meta":{"origin":113385,"position":4},"title":"TeleVue Nebustar UHC 1.25\" - UHC Filter","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"1.25-inch Nebustar UHC filter as an all-round contrast filter for emission nebulae.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Filters Filter UHC Nebustar 1,25\" zwart 1,25 inch UHC Nebustar filter met lichtgroen glas en TeleVue Bandmate Type 2 opdruk op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-UHC-Nebustar-1-25-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-UHC-Nebustar-1-25-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-UHC-Nebustar-1-25-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Filters-Filter-UHC-Nebustar-1-25-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":25233,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-h-beta-filter-2-inch\/","url_meta":{"origin":113385,"position":5},"title":"Omegon Pro H-Beta Filter 2 inch","author":"","date":"07-08-2025","format":false,"excerpt":"H-beta filter in 2 inch mounting for wide-field eyepieces. Brings out nebulae like the California Nebula and Horsehead Nebula under a dark sky.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"h-beta filter 2 inch","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-H-Beta-filter-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/113385","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=113385"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/113383"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=113385"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=113385"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=113385"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=113385"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}