{"id":25236,"date":"2025-08-07T17:07:27","date_gmt":"2025-08-07T15:07:27","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=25236"},"modified":"2026-03-03T20:21:07","modified_gmt":"2026-03-03T19:21:07","slug":"omegon-pro-sii-7nm-filter-125","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/omegon-pro-sii-7nm-filter-125\/","title":{"rendered":"Omegon Pro SII 7nm Filter 1.25\u2033"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>Omegon Pro SII 7nm Filter 1.25\u2033<\/strong> is a professional narrow-band filter for astrophotography, designed to pass only light with a wavelength around 672 nanometers - the emission line of ionized sulfur (SII). This wavelength, along with H-alpha and OIII, forms the classic basis of the Hubble palette, which is used to image deep structures in nebulae colorfully and with scientific accuracy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thanks to its very narrow bandwidth of 7 nanometers, the filter is extremely effective at suppressing unwanted light, such as from the moon or artificial lighting. This results in extremely high contrast even when shooting from suburban areas. The high transmission in the SII range makes it possible to clearly capture faint sulfur emissions in, for example, the Rosette Nebula or the Lobster Nebula.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The filter is encased in a rugged 1.25\u2033 aluminum mount, fully compatible with filter wheels and camera accessories that support this size. The optical glass features multiple anti-reflection coatings for maximum signal output and minimal stray light.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Advantages<\/strong><br>\u2713 Isolates the SII spectrum (672 nm) for accurate neural recordings<br>\u2713 Only 7 nm wide - optimal contrast under any sky<br>\u2713 Indispensable in narrowband astrophotography (Hubble palette)<br>\u2713 Works with all 1.25\u2033 filter wheels and camera adapters<br>\u2713 High transmission, low reflection - for sharp and clean image<\/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><strong>Type:<\/strong> Narrowband SII filter<\/li>\n\n\n\n<li><strong>Connection:<\/strong> 1.25 inches (31.75 mm)<\/li>\n\n\n\n<li><strong>Transmission band:<\/strong> Center at 672 nm, 7 nm wide<\/li>\n\n\n\n<li><strong>Mounting:<\/strong> Black anodized aluminum with fine threads<\/li>\n\n\n\n<li><strong>Coating:<\/strong> Multiple anti-reflective<\/li>\n\n\n\n<li><strong>Application:<\/strong> Astrophotography of emission nebulae (sulfur-II)<\/li>\n\n\n\n<li><strong>Not suitable for:<\/strong> Visual perception<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Application<\/strong><br>The Omegon Pro SII 7nm Filter 1.25\u2033 is intended for serious astrophotographers working with a monochrome camera and narrowband workflow. Combine this filter with H-alpha and OIII for full Hubble palette shots, showing detailed structures in complex nebulae such as the Veil Nebula or the Cone Nebula. An indispensable extension for any advanced setup<\/p>","protected":false},"excerpt":{"rendered":"<p data-start=\"273\" data-end=\"717\">\u00a0<\/p>\n<p data-start=\"116\" data-end=\"271\">Omegon Pro SII 7nm Filter 1.25\u2033 - narrowband filter for astrophotography in the sulfur II spectrum, ideal for Hubble palette shots.<\/p>","protected":false},"featured_media":25196,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[126],"product_cat":[56,587,588,3138],"product_tag":[],"class_list":["post-25236","product","type-product","status-publish","has-post-thumbnail","product_brand-omegon","product_cat-telescoop-accessoires","product_cat-camera-accessoires","product_cat-filters","product_cat-imaging-filters-smalband-en-lrgb","product_shipping_class-licht","first","instock","sale","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":25239,"url":"https:\/\/staging.telescoop.nl\/en\/omegon-pro-sii-ccd-filter-125\/","url_meta":{"origin":25236,"position":0},"title":"Omegon Pro SII CCD Filter 1.25\u2033","author":"","date":"07-08-2025","format":false,"excerpt":"\u00a0 Omegon Pro SII CCD Filter 1,25\" \u2013 smalbandfilter voor monochrome camera\u2019s, geoptimaliseerd voor het zwavel-II spectrum (672 nm).","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Omegon Pro SII CCD Filter 1,25\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":32644,"url":"https:\/\/staging.telescoop.nl\/en\/ioptron-sii-125-filters\/","url_meta":{"origin":25236,"position":1},"title":"iOptron SII 1.25\u2033 Filters","author":"","date":"06-11-2025","format":false,"excerpt":"iOptron SII 1.25\" Filters comes with 7 nm narrowband sulfur emission filter in aluminum mount - ideal for astrophotography of emission and planetary nebulae with monochrome cameras.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-SII-125-Filters.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-SII-125-Filters.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-SII-125-Filters.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-SII-125-Filters.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":25242,"url":"https:\/\/staging.telescoop.nl\/en\/omegon-pro-sii-ccd-filter-2-inch\/","url_meta":{"origin":25236,"position":2},"title":"Omegon Pro SII CCD Filter 2 inch","author":"","date":"07-08-2025","format":false,"excerpt":"\u00a0 Omegon Pro SII CCD Filter 2 inches - narrowband filter for astrophotography in the sulfur-II spectrum, optimized for full-frame monochrome cameras.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Omegon Pro SII CCD Filter 2 inch","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-Pro-SII-CCD-filter-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":92622,"url":"https:\/\/staging.telescoop.nl\/en\/omegon-pro-veil-sii-filter-7nm-2-inch-narrowband\/","url_meta":{"origin":25236,"position":3},"title":"Omegon Pro Veil SII Filter 7nm (2 inch)","author":"","date":"06-01-2026","format":false,"excerpt":"Omegon Pro Veil SII Filters comes with SII 7nm narrowband filter in 2\" aluminum mount, high-quality glass coating and convenient protective box - ideal for photographing emission nebulae and supernova remnants under light-polluted conditions.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Filters-Pro-Veil-SII-7nm-2-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Filters-Pro-Veil-SII-7nm-2-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Filters-Pro-Veil-SII-7nm-2-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Filters-Pro-Veil-SII-7nm-2-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":30325,"url":"https:\/\/staging.telescoop.nl\/en\/baader-narrowband-sii-filter-cmos-f-2-highspeed-1-25-inch\/","url_meta":{"origin":25236,"position":4},"title":"Baader Narrowband SII Filter CMOS f\/2 Highspeed 1.25 inches","author":"","date":"06-10-2025","format":false,"excerpt":"Baader Filters SII CMOS f\/2 Highspeed 1.25\" comes with protective filter box - narrowband filter tuned for the sulfur-emission line (SII) at 672.4 nm, optimized for fast f\/2 telescopes. \u00a0 \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Baader Filters SII CMOS f\/2 Highspeed 1,25\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":29093,"url":"https:\/\/staging.telescoop.nl\/en\/optolong-sii-filter-2-inch\/","url_meta":{"origin":25236,"position":5},"title":"Optolong SII Filter 2 inch","author":"","date":"20-09-2025","format":false,"excerpt":"\u00a0 The Optolong SII Filter 2\" comes with an aluminum housing and a narrow bandwidth around 672 nm \u2013 a specialized narrowband filter for emission nebulae and narrowband astrophotography.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters SII Filter 2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SII-Filter-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-SII-Filter-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SII-Filter-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SII-Filter-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SII-Filter-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SII-Filter-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/25236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=25236"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/25196"}],"wp:attachment":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=25236"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=25236"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=25236"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=25236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}