{"id":32643,"date":"2025-11-06T14:44:05","date_gmt":"2025-11-06T13:44:05","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=32643"},"modified":"2026-10-13T10:54:52","modified_gmt":"2026-10-13T08:54:52","slug":"ioptron-1-25-inch-filters-h-alpha","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/ioptron-1-25-inch-filters-h-alpha\/","title":{"rendered":"iOptron 1.25\u2033 Filters H-alpha"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>iOptron 1.25\u2033 Filters H-alpha: H-alpha narrowband filter of 7 nm<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This narrowband filter transmits only the deep red light of the H-alpha emission line around 656 nm, the wavelength at which hydrogen nebulae glow most brightly. Structures and faint outer extensions that get drowned out in broadband are brought into sharp focus with this.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The 7 nm full-width at half-maximum blocks almost all other light, including light pollution and moonlight. As a result, H-alpha can be photographed well even from the city and with the Moon in the sky.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-125-Filters-H-alpha.jpg\" alt=\"iOptron 1.25\" filters title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Building block of narrowband palettes<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">H-alpha is the basis of every narrowband palette: as the red channel in HOO or as the green channel in the Hubble palette SHO. The 1.25-inch aluminum cell fits into standard filter wheels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Included<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>H-alpha filter, 1.25\u2033 mounted<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Featured accessories<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Combine with iOptron's OIII and SII filters for the full Hubble palette.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>For whom yes and for whom no<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Monochrome emission nebula photographers, even from light-polluted areas<\/li>\n\n\n\n<li>\u2717 Visual observers and color cameras without dual bandpass: this filter is not intended for them<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Specifications<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Emission line<\/strong><\/td><td>H-alpha, 656 nm<\/td><\/tr><tr><td><strong>Half-value width<\/strong><\/td><td>7 nm<\/td><\/tr><tr><td><strong>Format<\/strong><\/td><td>1.25-inch aluminum vatting<\/td><\/tr><tr><td><strong>Observation goals<\/strong><\/td><td>Narrowband photography with monochrome cameras<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">You can find more mounts and accessories for this brand at the <a href=\"https:\/\/www.telescoop.nl\/en\/brands\/ioptron\/\">iOptron brand page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>iOptron H-alpha line filter 1.25\u2033 with 7 nm bandwidth around 656 nm, in an aluminum cell, for emission nebulae with monochrome cameras.<\/p>","protected":false},"featured_media":96737,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[2790],"product_cat":[3138,469,588,56],"product_tag":[],"class_list":["post-32643","product","type-product","status-publish","has-post-thumbnail","product_brand-ioptron","product_cat-imaging-filters-smalband-en-lrgb","product_cat-astro-fotografie","product_cat-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":[32642,32644],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":92543,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-h-alpha-filter-7nm-1-25-inch\/","url_meta":{"origin":32643,"position":0},"title":"Omegon Pro H-Alpha Filter 7nm 1.25 inch","author":"","date":"06-01-2026","format":false,"excerpt":"H-alpha narrow band filter with 7 nm transmission for astrophotography of hydrogen clouds. Provides high contrast, even from urban areas with high light pollution.","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\/01\/Omegon-Filters-pro-H-Alpha-7-nm-filter-1-25-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":15356,"url":"https:\/\/www.telescoop.nl\/en\/zwo-h-alpha-sii-oiii-filterset-31-mm-losse-filters\/","url_meta":{"origin":32643,"position":1},"title":"ZWO H-Alpha SII OIII filter set 31 mm loose filters","author":"","date":"06-07-2025","format":false,"excerpt":"Narrowband set of three separate 31 mm filters (H-alpha 656 nm, SII 672 nm, OIII 501 nm) with a 7 nm bandwidth. 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