{"id":30325,"date":"2025-10-06T13:08:31","date_gmt":"2025-10-06T11:08:31","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=30325"},"modified":"2026-03-13T10:19:03","modified_gmt":"2026-03-13T09:19:03","slug":"baader-narrowband-sii-filter-cmos-f-2-highspeed-1-25-inches","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/baader-narrowband-sii-filter-cmos-f-2-highspeed-1-25-inch\/","title":{"rendered":"Baader Narrowband SII Filter CMOS f\/2 Highspeed 1.25 inches"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The Baader Filters SII CMOS f\/2 Highspeed 1.25\u2033 is designed specifically for modern CMOS cameras and high-speed optical systems such as RASA and HyperStar. This filter is precisely matched to the <strong>SII emission line (672.4 nm)<\/strong> and optimized for f\/2 light cones. This keeps the transmission perfectly at wavelength, with no shift or light loss in fast systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Baader hard coating technology<\/strong> ensures maximum durability and prevents reflections, halos and oxidation. Thanks to the high transmission (&gt;90%) within a bandwidth of about 6.5 nm, weak SII signals in emission nebulae become clearly visible even under light-polluted conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Together with the H\u03b1 and OIII filters, this SII filter forms an ideal narrowband trio for <strong>Hubble palette images (SHO)<\/strong>. The results provide high-contrast, scientifically accurate color compositions of nebulae such as the Pelican Nebula, Veil Nebula and Rosette Nebula.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Application:<\/strong><br>Perfect for narrowband astrophotography with CMOS cameras and fast telescopes up to f\/2.<br>Ideal for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SII structures in emission nebulae<\/li>\n\n\n\n<li>RASA and HyperStar systems<\/li>\n\n\n\n<li>Deep-sky projects with H\u03b1 and OIII combination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Specifications:<\/strong><br>Filter type: SII narrowband (CMOS f\/2 Highspeed)<br>Central wavelength: 672.4 nm<br>Bandwidth (FWHM): \u00b16.5 nm<br>Transmission:&gt;90%<br>Barrel size: 1.25\u2033<br>Coating: Hard, anti-reflection<br>Compatible: CMOS cameras, f\/2 optics<br>Country of origin: Germany<\/p>","protected":false},"excerpt":{"rendered":"<p data-start=\"60\" data-end=\"290\">Baader Filters SII CMOS f\/2 Highspeed 1.25\u2033 comes with protective filter box - narrowband filter tuned for the sulfur-emission line (SII) at 672.4 nm, optimized for fast f\/2 telescopes.<\/p>\n<p data-start=\"292\" data-end=\"688\">\u00a0<\/p>\n<p data-start=\"7190\" data-end=\"7494\">\u00a0<\/p>","protected":false},"featured_media":30327,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[541],"product_cat":[587,469,588,3138,56],"product_tag":[],"class_list":["post-30325","product","type-product","status-publish","has-post-thumbnail","product_brand-baader","product_cat-camera-accessoires","product_cat-astro-fotografie","product_cat-filters","product_cat-imaging-filters-smalband-en-lrgb","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":[],"_links":{"self":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/30325","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=30325"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/30327"}],"wp:attachment":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=30325"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=30325"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=30325"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=30325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}