{"id":15337,"date":"2025-07-05T17:44:22","date_gmt":"2025-07-05T15:44:22","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=15337"},"modified":"2026-08-25T15:09:44","modified_gmt":"2026-08-25T13:09:44","slug":"zwo-clear-glass-filter-d21","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/zwo-helderglasfilter-d21\/","title":{"rendered":"ZWO Clear Glass Filter D21"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>ZWO Helderglasfilter D21: sensorbescherming zonder beeldverlies<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Dit transparante filter beschermt de sensor van je ZWO ASI-camera tegen stof, vocht en krassen, zonder het beeld merkbaar te be\u00efnvloeden. Met 95% transmissie en een multicoating tegen reflecties blijft je opname helder en contrastrijk.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Op spiegeltelescopen is dit heldere glas de logische keuze als afsluiting van de camera. Gebruik je een refractor? Kies dan de ZWO IR-blocking variant in D21-formaat: die voorkomt daarnaast focusverschuiving door infrarood licht.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>95% transmissie: geen zichtbaar verlies van scherpte of contrast<\/li>\n\n\n<li>Houdt stof en vocht bij de sensor weg tijdens lange sessies<\/li>\n\n\n<li>M42 x 0,75 schroefdraad, direct passend op D21-camera&#8217;s<\/li>\n\n\n<li>Eenvoudig te reinigen met een luchtblazer of lensdoek<\/li>\n\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Compatibility<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Geschikt voor ZWO ASI-camera&#8217;s met D21-venster en M42-aansluiting. Monteer het filter als eerste element op de camera of in het filterwiel, v\u00f3\u00f3r eventuele andere filters.<\/p>\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>Format<\/strong><\/td><td>D21 (M42 x 0.75)<\/td><\/tr><tr><td><strong>Filter type<\/strong><\/td><td>clear glass<\/td><\/tr><tr><td><strong>Transmission<\/strong><\/td><td>95%<\/td><\/tr><tr><td><strong>Coating<\/strong><\/td><td>multicoating, anti-reflection<\/td><\/tr><tr><td><strong>Glass thickness<\/strong><\/td><td>2 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Goedkope verzekering voor de sensor van je <a href=\"https:\/\/www.telescoop.nl\/en\/brands\/zwo\/\">ZWO<\/a>-camera. Twijfel je tussen helder glas en IR-blocking? Spiegeltelescoop: helder glas. Refractor: IR-blocking.<\/p>","protected":false},"excerpt":{"rendered":"<p>Helderglasfilter D21 met 95% transmissie en M42-schroefdraad. Beschermt de sensor van je ZWO ASI-camera tegen stof en vocht zonder invloed op het beeld.<\/p>","protected":false},"featured_media":21094,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[123],"product_cat":[588,56],"product_tag":[],"class_list":["post-15337","product","type-product","status-publish","has-post-thumbnail","product_brand-zwo","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":15341,"url":"https:\/\/www.telescoop.nl\/en\/zwo-helderglasfilter-d25\/","url_meta":{"origin":15337,"position":0},"title":"ZWO Clear Glass Filter D25","author":"","date":"05-07-2025","format":false,"excerpt":"D25 clear glass filter with 95% transmission and M42 thread. Protects the sensor of your ZWO ASI camera from dust and moisture without affecting the image.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"ZWO Klarglasfilter D25","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Helderglasfilter-ASI-D25.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-Helderglasfilter-ASI-D25.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Helderglasfilter-ASI-D25.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Helderglasfilter-ASI-D25.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Helderglasfilter-ASI-D25.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-Helderglasfilter-ASI-D25.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":15362,"url":"https:\/\/www.telescoop.nl\/en\/zwo-ir-blocking-filter-d21\/","url_meta":{"origin":15337,"position":1},"title":"ZWO IR-blocking filter D21","author":"","date":"06-07-2025","format":false,"excerpt":"IR-blocking filter in D21 format (M42) with 90% visible light transmission. Protects the sensor and prevents focus shift caused by infrared light in refracting telescopes.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"ZWO IR-Sperrfilter D21","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D21.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D21.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D21.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D21.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D21.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D21.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":15365,"url":"https:\/\/www.telescoop.nl\/en\/zwo-ir-blocking-filter-d25\/","url_meta":{"origin":15337,"position":2},"title":"ZWO IR-blocking filter D25","author":"","date":"06-07-2025","format":false,"excerpt":"IR-blocking filter in D25 format (M42) with 90% visible light transmission. Protects the sensor and prevents focus shift caused by infrared light in refracting telescopes.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"ZWO IR-Sperrfilter D25","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D25.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D25.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D25.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D25.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D25.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Blocking-filters-IR-ASI-D25.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":104543,"url":"https:\/\/www.telescoop.nl\/en\/zwo-camera-asi-585-mc-air-color\/","url_meta":{"origin":15337,"position":3},"title":"ZWO Camera ASI 585 MC-Air Color","author":"Info telescoop","date":"12-03-2026","format":false,"excerpt":"All-in-one astro camera with Sony IMX585 sensor (8.3 MP, glow-free), integrated SC2210 guide sensor, and built-in ASIAIR computer with dual-band Wi-Fi. Deep-sky without a laptop or separate modules.","rel":"","context":"With 1 comment","block_context":{"text":"With 1 comment","link":"https:\/\/www.telescoop.nl\/en\/zwo-camera-asi-585-mc-air-color\/#comments"},"img":{"alt_text":"ZWO Camera ASI 585 MC-Air Color","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/ZWO-Camera-ASI-585-MC-Air-Color.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/ZWO-Camera-ASI-585-MC-Air-Color.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/ZWO-Camera-ASI-585-MC-Air-Color.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/ZWO-Camera-ASI-585-MC-Air-Color.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/ZWO-Camera-ASI-585-MC-Air-Color.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/ZWO-Camera-ASI-585-MC-Air-Color.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":13229,"url":"https:\/\/www.telescoop.nl\/en\/zwo-camera-asi-120mm-mini-mono\/","url_meta":{"origin":15337,"position":4},"title":"ZWO Camera ASI 120MM Mini Mono","author":"","date":"19-03-2025","format":false,"excerpt":"Compact monochrome camera (AR0130CS, 1280 x 960, 3.75 micrometer) for autoguiding and moon and planet photography. Only 60 grams, with ST-4 port and 1.25 inch mount.","rel":"","context":"With 1 comment","block_context":{"text":"With 1 comment","link":"https:\/\/www.telescoop.nl\/en\/zwo-camera-asi-120mm-mini-mono\/#comments"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/03\/ZWO-Camera-ASI-120MM-Mini-Mono.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/03\/ZWO-Camera-ASI-120MM-Mini-Mono.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/03\/ZWO-Camera-ASI-120MM-Mini-Mono.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/03\/ZWO-Camera-ASI-120MM-Mini-Mono.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/03\/ZWO-Camera-ASI-120MM-Mini-Mono.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/03\/ZWO-Camera-ASI-120MM-Mini-Mono.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":15348,"url":"https:\/\/www.telescoop.nl\/en\/zwo-lrgb-filterset-36-mm-losse-filters\/","url_meta":{"origin":15337,"position":5},"title":"ZWO LRGB filter set 36 mm separate filters","author":"","date":"06-07-2025","format":false,"excerpt":"LRGB filter set consisting of four separate 36 mm interference filters (L with UV\/IR block, R, G, B) with over 92% transmission. For large mono sensors in standard filter wheels.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"ZWO LRGB-Filterset 36 mm lose Filter","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-LRGB-Filter-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-LRGB-Filter-36mm-unmounted.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-LRGB-Filter-36mm-unmounted.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-LRGB-Filter-36mm-unmounted.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-LRGB-Filter-36mm-unmounted.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/ZWO-Filters-LRGB-Filter-36mm-unmounted.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/15337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=15337"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/21094"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=15337"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=15337"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=15337"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=15337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}