{"id":29024,"date":"2025-09-20T19:56:15","date_gmt":"2025-09-20T17:56:15","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=29024"},"modified":"2026-03-20T13:03:07","modified_gmt":"2026-03-20T12:03:07","slug":"optolong-l-ultimate-filter-3nm-2-inch","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/optolong-l-ultimate-filter-3nm-2-inch\/","title":{"rendered":"Optolong L-Ultimate Filter 3nm 2 inch"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Optolong Filters L-Ultimate 2\u2033 is the flagship among Optolong's dual-band narrowband filters. Designed for astrophotography with color cameras (One-Shot-Color CMOS and DSLR), this filter allows only the emission lines H-alpha (656 nm) and OIII (500 nm) to pass through. With an extremely narrow passband of only 3 nm per line, the L-Ultimate blocks virtually all unwanted wavelengths, including interfering artificial light and moonlight.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The result is unparalleled contrast and detail in emission nebulae such as the Veil Nebula, the North American Nebula or the Orion Nebula. Even in heavily light-polluted urban areas, structures remain visible that can normally only be photographed under dark sky conditions. The narrow transmission peaks also make the filter ideal for long exposure times and stacking, where subtle nebular detailing comes to the fore.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The L-Ultimate differs from wider dual-band filters such as the L-eNhance and L-eXtreme by having an even narrower bandwidth, resulting in a higher signal-to-noise ratio. This makes the filter particularly popular among advanced astrophotographers who want to get the most out of their camera and optics. The filter is made of high-quality optical glass with multiple anti-reflection coatings and mounted in a rugged 2\u2033 aluminum mount, suitable for use in filter wheels and 2\u2033 adapters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Observation goals<\/strong><br>This filter is ideal for serious astrophotographers who photograph emission nebulae with an OSC camera or DSLR, and who still want to capture top-quality images under heavy light pollution or during moonlight. Not suitable for visual use, as the extremely narrow bandwidth allows too little light to pass through 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: Dual-band ultra narrowband filter<\/li>\n\n\n\n<li>Diameter: 2\u2033 mount<\/li>\n\n\n\n<li>Transmittance: H-alpha (656 nm, 3 nm) and OIII (500 nm, 3 nm)<\/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 Emission nebulae in highly light-polluted areas<\/li>\n\n\n\n<li>\u2713 Astrophotography with OSC and DSLR cameras<\/li>\n\n\n\n<li>\u2713 Long exposure times and stacking<\/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=\"374\" data-end=\"837\">\u00a0<\/p>\n<p data-start=\"142\" data-end=\"372\">Optolong Filters L-Ultimate 2&#8243; wordt geleverd met aluminium vatting\u00a0 &#8211; high-end filter voor maximale contrasten in nevel-astrofotografie, zelfs bij zware lichtvervuiling.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"featured_media":29035,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1548],"product_cat":[3139,587,588,56],"product_tag":[],"class_list":["post-29024","product","type-product","status-publish","has-post-thumbnail","product_brand-optolong","product_cat-lichtvervuilingsfilters-light-pollution","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":28848,"url":"https:\/\/www.telescoop.nl\/en\/optolong-filters-l-ultimate-125\/","url_meta":{"origin":29024,"position":0},"title":"Optolong L-Ultimate 1.25\u201d","author":"","date":"19-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters L-Ultimate 1,25'' wordt geleverd met een ultra-smalband transmissie en is ideaal voor hoge-contrastopnamen van emissienevels, zelfs in zwaar lichtvervuilde gebieden.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters L-Ultimate 1,25''","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.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-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":28985,"url":"https:\/\/www.telescoop.nl\/en\/optolong-l-extreme-filter-2-inch\/","url_meta":{"origin":29024,"position":1},"title":"Optolong L-eXtreme Filter 2 inch","author":"","date":"20-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters L-eXtreme 2\" comes with an aluminum mounting \u2013 high-quality nebula filter for astrophotography from light-polluted areas.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters L-eXtreme 2\"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-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-eXtreme-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":28970,"url":"https:\/\/www.telescoop.nl\/en\/optolong-l-extreme-filter-1-25-inch\/","url_meta":{"origin":29024,"position":2},"title":"Optolong L-eXtreme Filter 1.25 inch","author":"","date":"20-09-2025","format":false,"excerpt":"\u00a0 Optolong L-eXtreme 1.25\" Filter with Aluminum Mount - powerful filter for nebula astrophotography from light-polluted areas.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters L-eXtreme 1,25\"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-1-25-.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-eXtreme-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-eXtreme-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":29000,"url":"https:\/\/www.telescoop.nl\/en\/optolong-l-para-filter-2-inch\/","url_meta":{"origin":29024,"position":3},"title":"Optolong L-Para Filter 2 inch","author":"","date":"20-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters L-Para 2\" wordt geleverd met aluminium vatting en meervoudige coating \u2013 correctiefilter dat kleurafwijkingen in snelle telescopen (f\/2\u2013f\/3) compenseert voor optimale astrofotografie.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters L-Para 2\"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Para-2-1.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-Para-2-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Para-2-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Para-2-1.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Para-2-1.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Para-2-1.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":28860,"url":"https:\/\/www.telescoop.nl\/en\/optolong-filters-l-pro-filter-77mm\/","url_meta":{"origin":29024,"position":4},"title":"Optolong L-Pro Filter 77mm","author":"","date":"19-09-2025","format":false,"excerpt":"\u00a0 Optolong Filters L-Pro Filter 77mm comes as a screw filter and reduces light pollution in astrophotography with DSLR and system cameras without losing natural colors.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters L-Ultimate 1,25''","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.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-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-L-Ultimate-1-25-.jpg?resize=700%2C400&ssl=1 2x, 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2\"","src":"https:\/\/i0.wp.com\/www.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\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-7nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.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\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-7nm-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-7nm-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-H-alpha-7nm-2-.jpg?resize=1400%2C800&ssl=1 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