{"id":15356,"date":"2025-07-06T19:32:05","date_gmt":"2025-07-06T17:32:05","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=15356"},"modified":"2026-03-03T20:25:46","modified_gmt":"2026-03-03T19:25:46","slug":"zwo-h-alpha-sii-oiii-filter-set-31-mm-loose-filters","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/zwo-h-alpha-sii-oiii-filterset-31-mm-losse-filters\/","title":{"rendered":"ZWO H-Alpha SII OIII filter set 31 mm loose filters"},"content":{"rendered":"

ZWO H-Alpha SII OIII filter set 31 mm loose filters<\/strong> contains three narrow-band interference filters (H-Alpha 656 nm, S II 672 nm and O III 501 nm) that block ambient light and capture faint nebulae in contrast. With a bandwidth of 7 nm, capture detailed structures in hydrogen nebulae, planetary nebulae and supernova remnants, even in urban light pollution.<\/p>\n\n\n\n

Key benefits<\/strong>
\u2713 Narrowband filters for maximum contrast enhancement in H-Alpha, S II and O III
\u2713 7 nm half-value bandwidth suppresses unwanted light without signal loss
\u2713 Homofocal design fits seamlessly with ZWO LRGB and color filters
\u2713 Loose 31 mm filters fit any standard filter wheel
\u2713 Aluminum housing for secure mounting and minimal reflection<\/p>\n\n\n\n

Practical application<\/strong>
Combine with a monochrome ZWO ASI camera and filter wheel to automatically switch H-Alpha, S II and O III exposures. Ideal for deep neon shots with added detail and contrast, even under backlit night skies.<\/p>\n\n\n\n

Technical specifications<\/strong>
- Format: 31 mm loose filters
- Filters: H-Alpha 656 nm, S II 672 nm, O III 501 nm
- Bandwidth: 7 nm (half value)
- Transmission: 80 %
- Housing: aluminum
- Application: narrowband astrophotography (photographic)<\/p>","protected":false},"excerpt":{"rendered":"

\u00a0<\/p>\n

ZWO H-Alpha SII OIII filter set 31 mm separate filters for high-contrast narrowband astrophotography with 7 nm bandwidth.<\/p>","protected":false},"featured_media":21110,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[123],"product_cat":[56,3137,588,3138],"product_tag":[],"class_list":["post-15356","product","type-product","status-publish","has-post-thumbnail","product_brand-zwo","product_cat-telescoop-accessoires","product_cat-deep-sky-filters","product_cat-filters","product_cat-imaging-filters-smalband-en-lrgb","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":15359,"url":"https:\/\/staging.telescoop.nl\/en\/zwo-h-alpha-sii-oiii-filterset-36-mm-losse-filters\/","url_meta":{"origin":15356,"position":0},"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\/staging.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\/staging.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\/staging.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\/staging.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\/staging.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\/staging.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":15371,"url":"https:\/\/staging.telescoop.nl\/en\/zwo-lijnfilterset-2-inch\/","url_meta":{"origin":15356,"position":1},"title":"ZWO Line Filter Set 2 inch","author":"","date":"06-07-2025","format":false,"excerpt":"\u00a0 ZWO line filter set 2 inch for narrowband astrophotography with H-Alpha, S II, O III. 7 nm bandwidth, homofocal and in convenient storage box.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"ZWO Linienfilterset 2 Zoll \u2013 Kontrast f\u00fcr Nebel","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Lijnfilterset-H-alpha-SII-OIII-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Lijnfilterset-H-alpha-SII-OIII-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Lijnfilterset-H-alpha-SII-OIII-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Lijnfilterset-H-alpha-SII-OIII-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Lijnfilterset-H-alpha-SII-OIII-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Lijnfilterset-H-alpha-SII-OIII-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":14831,"url":"https:\/\/staging.telescoop.nl\/en\/zwo-filters-filter-set-h-alpha-sii-oiii-125\/","url_meta":{"origin":15356,"position":2},"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\/staging.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\/staging.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\/staging.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\/staging.telescoop.nl\/wp-content\/uploads\/2025\/06\/ZWO-Filters-Filter-Set-H-alpha-SII-OIII-1-25-.jpg?resize=700%2C400&ssl=1 2x, 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