{"id":14819,"date":"2025-06-23T20:25:57","date_gmt":"2025-06-23T18:25:57","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=14819"},"modified":"2026-03-03T20:26:00","modified_gmt":"2026-03-03T19:26:00","slug":"zwo-filters-duo-band-1-25","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/zwo-filters-duo-band-1-25\/","title":{"rendered":"ZWO Filters Duo-Band 1.25"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Do you want to photograph emission nebulae and deep-sky objects with your color camera, but suffer from light pollution? Then the ZWO Duo-Band 1.25\u2033 is the ideal upgrade. Designed for astrophotography with ZWO ASI Color cameras, such as the ASI533MC or ASI2600MC, this dual narrowband filter allows you to capture H\u03b1 and OIII light without a complex setup.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What exactly does the filter do?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Passes only the specific wavelengths of hydrogen (H\u03b1 at 656 nm) and oxygen (OIII at 500 nm)<\/li>\n\n\n\n<li>Blocks stray light from street lights and moonlight<\/li>\n\n\n\n<li>Enhances the contrast and detail of nebulae, supernova remnants and planetary nebulae<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Its combination of simplicity, effectiveness and price makes it one of the most popular upgrades for beginners and advanced color camera users alike.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What you can see \/ photograph with it<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Emission nebulae (such as the Veil Nebula or Orion Nebula)<br>\u2713 Planetary nebulae with rich detail<br>\u2713 Supernova remnants<br>\u2713 Deep-sky objects in light-polluted environment<br>\u2713 Improved contrast in photography with ASI Color cameras<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Specifications<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td><strong>Filter type<\/strong><\/td><td>Duo-band narrowband filter<\/td><\/tr><tr><td><strong>Appropriate size<\/strong><\/td><td>1.25\u2033 (31.7 mm)<\/td><\/tr><tr><td><strong>Material mount<\/strong><\/td><td>Aluminum<\/td><\/tr><tr><td><strong>Light transmission OIII<\/strong><\/td><td>&gt;90% at 486, 496, 501 nm<\/td><\/tr><tr><td><strong>Light transmittance H\u03b1<\/strong><\/td><td>&gt;80% at 656.3 nm<\/td><\/tr><tr><td><strong>Bandwidth<\/strong><\/td><td>OIII: 35 nm, H\u03b1: 15 nm<\/td><\/tr><tr><td><strong>Visual use<\/strong><\/td><td>Possible, but primarily intended for photography<\/td><\/tr><tr><td><strong>Compatible with<\/strong><\/td><td>All 1.25\u2033 focusers and color cameras (ZWO ASI MC series)<\/td><\/tr><tr><td><strong>Observation goals<\/strong><\/td><td>Light pollution suppression, contrast enhancement, deep-sky imaging<\/td><\/tr><tr><td><strong>Design<\/strong><\/td><td>UHC-type duo filter<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"<p data-start=\"324\" data-end=\"501\">The ZWO Filters Duo-Band 1.25\u2033 filter is the solution for color cameras in light-polluted areas. Ideal for narrowband photography of nebulae without a filter wheel or mono camera.<\/p>","protected":false},"featured_media":20378,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[123],"product_cat":[56],"product_tag":[],"class_list":["post-14819","product","type-product","status-publish","has-post-thumbnail","product_brand-zwo","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":14825,"url":"https:\/\/www.telescoop.nl\/en\/zwo-filters-duo-band-2-inch\/","url_meta":{"origin":14819,"position":0},"title":"ZWO Filters Duo-Band 2 inch","author":"","date":"23-06-2025","format":false,"excerpt":"The ZWO Filters Duo-Band 2 inch is a narrow-band filter for color cameras. Ideal for deep-sky photography in light-polluted areas, without a mono camera or filter wheel.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Duo-Band-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Duo-Band-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Duo-Band-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Duo-Band-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Duo-Band-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Duo-Band-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":14831,"url":"https:\/\/www.telescoop.nl\/en\/zwo-filters-filter-set-h-alpha-sii-oiii-125\/","url_meta":{"origin":14819,"position":1},"title":"ZWO Filters Filter-Set H-alpha, SII, OIII 1.25\u2033","author":"","date":"23-06-2025","format":false,"excerpt":"De ZWO Filters Filter-Set H-alpha, SII, OIII 1,25\" is perfect voor astrofotografie van zwakke nevels. Ontworpen voor gebruik met mono-camera\u2019s en filterwielen, met uitstekende lichtvervuilingsonderdrukking.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":15356,"url":"https:\/\/www.telescoop.nl\/en\/zwo-h-alpha-sii-oiii-filterset-31-mm-losse-filters\/","url_meta":{"origin":14819,"position":2},"title":"ZWO H-Alpha SII OIII filter set 31 mm loose filters","author":"","date":"06-07-2025","format":false,"excerpt":"\u00a0 ZWO H-Alpha SII OIII filter set 31 mm separate filters for high-contrast narrowband astrophotography with 7 nm bandwidth.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"ZWO H-Alpha SII OIII Filtersatz 31 mm lose Filter","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filterset-H-Alpha-SII-OIII-31mm-unmounted.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filterset-H-Alpha-SII-OIII-31mm-unmounted.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filterset-H-Alpha-SII-OIII-31mm-unmounted.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filterset-H-Alpha-SII-OIII-31mm-unmounted.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filterset-H-Alpha-SII-OIII-31mm-unmounted.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filterset-H-Alpha-SII-OIII-31mm-unmounted.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":15359,"url":"https:\/\/www.telescoop.nl\/en\/zwo-h-alpha-sii-oiii-filterset-36-mm-losse-filters\/","url_meta":{"origin":14819,"position":3},"title":"ZWO H-Alpha SII OIII filter set 36 mm separate filters","author":"","date":"06-07-2025","format":false,"excerpt":"\u00a0 ZWO H-Alpha SII OIII filter set 36 mm separate filters for high-contrast narrowband astrophotography with 7 nm bandwidth, homofocal and reflection-free.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"ZWO H-Alpha SII OIII Filtersatz 36 mm lose Filter","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-36mm-unmounted.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-36mm-unmounted.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-36mm-unmounted.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-36mm-unmounted.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-36mm-unmounted.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-36mm-unmounted.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":30325,"url":"https:\/\/www.telescoop.nl\/en\/baader-narrowband-sii-filter-cmos-f-2-highspeed-1-25-inch\/","url_meta":{"origin":14819,"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 - 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