{"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":"2026-07-20T14:50:44","modified_gmt":"2026-07-20T12:50:44","slug":"baader-narrowband-sii-filter-cmos-f-2-highspeed-1-25-inches","status":"publish","type":"product","link":"https:\/\/www.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":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>Baader Narrowband SII Filter CMOS f\/2 Highspeed 1.25 inch: smalband voor extreem snelle optiek<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">De zwavellijn (SII) is het derde kanaal van het klassieke Hubble-palet. Dit filter isoleert die lijn met een halfwaardebreedte van 6,5 nm en maakt SHO-composieten compleet. De f\/2 Highspeed uitvoering is speciaal ontworpen voor extreem snelle optiek: de doorlaatband is voorgeshift, zodat het filter bij openingsverhoudingen van f\/3.4 tot f\/1.8 op de juiste golflengte blijft werken.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bij snelle systemen zoals een Celestron RASA of Hyperstar valt het licht onder grote hoeken op het filter, waardoor de doorlaatband van een standaardfilter verschuift en signaal verloren gaat. De Highspeed-serie compenseert dat en behoudt de volle transmissie op de SII-lijn.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-.jpg\" alt=\"Baader Narrowband SII f\/2 Highspeed filter 1,25 inch\" title=\"\"><\/figure><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-1.jpg\" alt=\"Baader Narrowband SII f\/2 Highspeed filter 1,25 inch\" title=\"\"><\/figure><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/10\/Baader-Filters-f-2-Highspeed-SII-CMOS-1-25-2.jpg\" alt=\"Baader Narrowband SII f\/2 Highspeed filter 1,25 inch\" title=\"\"><\/figure><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">CMOS-optimized<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The filters are optimized for modern CMOS cameras: the 6.5 nm FWHM has been chosen for balanced exposures across the channels, and the Reflex-Blocker hard coating suppresses halos around bright stars. Blackened edges and the Life-Coat edge seal make the coating resistant to years of use.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">What you use this filter for<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Dit filter is gemaakt voor Hubble-palet opnames (SHO) van emissienevels, samen met H-alfa en OIII. Door de smalle doorlaat wordt de hemelachtergrond diep donker, ook onder lichtvervuilde hemel of bij maanlicht, en komt de diep rode nevelstructuur maximaal naar voren.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Featured accessories<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Combine this filter with the other two lines in the series (H-alpha, OIII, and SII) for complete narrowband or Hubble palette captures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">For whom yes and for whom no<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>\u2713 Astrophotographers with fast optics (f\/1.8 to f\/3.4) such as RASA and Hyperstar systems<\/li><li>\u2713 Who wants to shoot narrowband under a light-polluted sky<\/li><li>Owners of slower telescopes (f\/4 and slower): the standard Baader Narrowband series without preshift is the right choice.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Emission line<\/strong><\/td><td>SII (672,4 nm)<\/td><\/tr><tr><td><strong>Half-value width<\/strong><\/td><td>6.5 nm<\/td><\/tr><tr><td><strong>Optimization<\/strong><\/td><td>f\/2 Highspeed, preshifted for f\/3.4 to f\/1.8<\/td><\/tr><tr><td><strong>Sensor Type<\/strong><\/td><td>CMOS-optimized, also suitable for CCD<\/td><\/tr><tr><td><strong>Size<\/strong><\/td><td>1.25 inches<\/td><\/tr><tr><td><strong>Coating<\/strong><\/td><td>Reflex-Blocker, Life-Coat, blackened edges<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">You can find more accessories for this merk at the <a href=\"\/en\/brands\/baader\/\">Baader merk Page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Baader Narrowband SII filter (6,5 nm) in f\/2 Highspeed uitvoering, maat 1,25 inch. Voorgeshift voor extreem snelle optiek van f\/3.4 tot f\/1.8, CMOS-geoptimaliseerd met Reflex-Blocker coating en Life-Coat.<\/p>","protected":false},"featured_media":30327,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[541],"product_cat":[3138,469,587,588,56],"product_tag":[],"class_list":["post-30325","product","type-product","status-publish","has-post-thumbnail","product_brand-baader","product_cat-imaging-filters-smalband-en-lrgb","product_cat-astro-fotografie","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":30334,"url":"https:\/\/www.telescoop.nl\/en\/baader-narrowband-sii-filter-cmos-f-2-highspeed-31mm\/","url_meta":{"origin":30325,"position":0},"title":"Baader Narrowband SII Filter CMOS f\/2 Highspeed 31mm","author":"","date":"06-10-2025","format":false,"excerpt":"Baader Narrowband SII filter (6,5 nm) in f\/2 Highspeed uitvoering, maat 31mm. 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