{"id":29063,"date":"2025-09-20T20:04:16","date_gmt":"2025-09-20T18:04:16","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=29063"},"modified":"2026-06-09T11:46:54","modified_gmt":"2026-06-09T09:46:54","slug":"optolong-oiii-filter-3nm-2-inch","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/optolong-oiii-filter-3nm-2-inch\/","title":{"rendered":"Optolong OIII Filter 3nm 2 inch"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Optolong Filters OIII 3nm 2\u2033 is a professional narrowband filter that passes only the OIII emission line around 500.7 nm with a bandwidth of only 3 nm. This makes it one of the most selective filters in its class, ideal for advanced astrophotographers who want to capture emission nebulae in maximum sharpness and contrast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The extremely narrow pass-through effectively suppresses virtually all interfering light from sodium and mercury lamps, as well as moonlight. The result is a dark sky background and an exceptionally high signal-to-noise ratio. Nebulae such as the Veil Nebula, Helix Nebula and planetary nebulae come into focus with unparalleled detail and texture.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The filter is made of high-quality optical glass and features multiple anti-reflection coatings, minimizing reflections and halos. The robust 2\u2033 aluminum mount makes it suitable for use in filter wheels and 2\u2033 adapters. Thanks to the high transmission of the OIII line, this filter is ideally suited for long exposure times and stacking, achieving impressive results even under highly light-polluted conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Observation goals<\/strong><br>This filter is intended for serious astrophotographers who want to capture emission nebulae in their purest form. It works optimally with monochrome cameras, possibly with a complete narrow-band set (Ha, OIII, SII). For color cameras the effect is more limited, but still usable. Not suitable for visual use, as the extremely narrow bandwidth allows too little light to pass through for the 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: OIII narrowband filter<\/li>\n\n\n\n<li>Bandwidth: 3 nm around 500.7 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 Very high contrasts under 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=\"342\" data-end=\"705\">\u00a0<\/p>\n<p data-start=\"138\" data-end=\"340\">Optolong Filters OIII 3nm 2&#8243; wordt geleverd met aluminium vatting en ultra-smalle doorlaat van 3 nm \u2013 high-end smalbandfilter voor extreem contrastrijke nevel-astrofotografie.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"featured_media":29068,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1548],"product_cat":[3138,587,588,56],"product_tag":[],"class_list":["post-29063","product","type-product","status-publish","has-post-thumbnail","product_brand-optolong","product_cat-imaging-filters-smalband-en-lrgb","product_cat-camera-accessoires","product_cat-filters","product_cat-telescoop-accessoires","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":29069,"url":"https:\/\/www.telescoop.nl\/en\/optolong-h-alpha-filter-3nm-2-inch\/","url_meta":{"origin":29063,"position":0},"title":"Optolong H-alpha Filter 3nm 2 inch","author":"","date":"20-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters H-alpha 3nm 2\" comes with an aluminum mount and ultra-narrow 3 nm passband \u2013 high-quality narrowband filter for emission nebulae with 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\/www.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\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-3nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.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\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-3nm-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-3nm-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-3nm-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":29024,"url":"https:\/\/www.telescoop.nl\/en\/optolong-l-ultimate-filter-3nm-2-inch\/","url_meta":{"origin":29063,"position":1},"title":"Optolong L-Ultimate Filter 3nm 2 inch","author":"","date":"20-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters L-Ultimate 2\" comes with an aluminum mount - high-end filter for maximum contrast in nebula astrophotography, even with heavy light pollution.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters L-Ultimate 2\"","src":"https:\/\/i0.wp.com\/www.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\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-2-.jpg?resize=1400%2C800&ssl=1 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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\/www.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\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":29141,"url":"https:\/\/www.telescoop.nl\/en\/optolong-sho-filter-kit-3nm-36mm\/","url_meta":{"origin":29063,"position":4},"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\/www.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\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-3nm-36mm.jpg?resize=525%2C300&ssl=1 1.5x, 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