{"id":34220,"date":"2025-11-17T15:31:23","date_gmt":"2025-11-17T14:31:23","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34220"},"modified":"2026-03-03T20:24:54","modified_gmt":"2026-03-03T19:24:54","slug":"william-optics-90-2-diagonal-mirror-dura-bright","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/william-optics-90-2-diagonaal-spiegel-dura-bright\/","title":{"rendered":"William Optics 90\u00b0 2\u2033 Diagonal Mirror Dura Bright"},"content":{"rendered":"

With the William Optics 90\u00b0<\/strong> Dura Bright zenith mirror you get the best out of your telescope. You notice it immediately: your image becomes brighter, more contrasty and much quieter than with a standard diagonal. This is due to the extremely high 99% reflection<\/strong>, allowing almost all the light captured to actually reach your eye. This keeps details visible even at high magnification.<\/p>\n\n\n\n

The thick 12 mm mirror ensures stable images even when the temperature changes. You don't have to worry about distortion or blurring. It just stays sharp. The 1\/12 lambda accuracy means the mirror surface is exceptionally flat, so your image remains clean and tight.<\/p>\n\n\n\n

The housing combines aluminum with carbon fiber. This not only looks beautiful, but also makes the diagonal strong and light. The ring clamp holds your eyepieces securely without scratching, while the filter thread ensures that you can use filters safely and directly. The included 2\u2033 to 1.25\u2033 adapter makes it easy to switch between eyepiece sizes.<\/p>\n\n\n\n

This is a diagonal that really lifts your image quality. No fine-tuning, no fuss. Just insert, secure and enjoy a clear and comfortable 90\u00b0 image.<\/p>\n\n\n\n

Specifications<\/strong><\/h3>\n\n\n\n

Capacity<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Telescope connection<\/td>2\u2033<\/td><\/tr>
Insight<\/td>90\u00b0<\/td><\/tr>
Optics coating<\/td>Dielectric<\/td><\/tr>
Surface reflection<\/td>99%<\/td><\/tr>
Surface accuracy<\/td>1\/12 lambda<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Details<\/strong><\/h3>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Upright image<\/td>Yes<\/td><\/tr>
Horizontal correction<\/td>-<\/td><\/tr>
Ring clamp<\/td>Yes<\/td><\/tr>
Filter thread<\/td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Equipment<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Eyepiece adapter<\/td>2\u2033 \/ 1,25\u2033<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

General<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Type<\/td>Divergent optics<\/td><\/tr>
Design<\/td>Diagonal mirror<\/td><\/tr>
Exterior material<\/td>Aluminum & carbon<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

William Optics 90\u00b0 comes with 2\u2033 and 1.25\u2033 eyepiece adapter, dielectric mirror coating, compression ring, filter thread and carbon housing - ready for maximum clarity and contrast.<\/p>\n

 <\/p>","protected":false},"featured_media":97591,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[56,591,3142],"product_tag":[],"class_list":["post-34220","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescoop-accessoires","product_cat-diagonalen","product_cat-zenitspiegels-en-zenitprisma-diagonals","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":34219,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-90-125-dura-bright-zenitspiegel\/","url_meta":{"origin":34220,"position":0},"title":"William Optics 90\u00b0, 1.25\u2033 Dura Bright zenith mirror","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 90 wordt geleverd met dielectrische spiegelcoating, 1,25\" oculairaansluiting, compressiering, koolstofvezel zijplaten en adapter \u2013 voor uitzonderlijk helder beeld en maximale contrast.","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\/11\/William-Optics-90%C2%B0-125-Dura-Bright-zenitspiegel-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Dura-Bright-zenitspiegel-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Dura-Bright-zenitspiegel-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Dura-Bright-zenitspiegel-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":33989,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-sc-adapters-dura-bright\/","url_meta":{"origin":34220,"position":1},"title":"William Optics SC Adapters Dura Bright","author":"","date":"16-11-2025","format":false,"excerpt":"William Optics SC Adapter comes with an SC thread for the William Optics Dura Bright 90\u00b0 2\" diagonal mirror. \u00a0","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\/11\/William-Optics-SC-Adapters-Dura-Bright-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-SC-Adapters-Dura-Bright-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-SC-Adapters-Dura-Bright-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-SC-Adapters-Dura-Bright-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":34142,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-90-125-zenitprisma-cat-51-wifd\/","url_meta":{"origin":34220,"position":2},"title":"William Optics 90\u00b0 1.25\u2033 Zenith prism Cat 51 WIFD","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 90\u00b0 wordt geleverd met dielectric gecoat BaK-4 zenitprisma, 2\"\/1,25\" adapter, ringklem en rechtopstaande beeldcorrectie \u2013 perfect voor natuur- en maanobservatie.","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\/11\/William-Optics-90%C2%B0-125-Zenitprisma-Cat-51-WIFD.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Zenitprisma-Cat-51-WIFD.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Zenitprisma-Cat-51-WIFD.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Zenitprisma-Cat-51-WIFD.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":90978,"url":"https:\/\/staging.telescoop.nl\/en\/sky-watcher-2-inch-zenitspiegel-90-graden\/","url_meta":{"origin":34220,"position":3},"title":"Sky-Watcher 2\u2033 Zenith mirror (90 degrees)","author":"","date":"03-12-2025","format":false,"excerpt":"Skywatcher Diagonal mirror comes with 90\u00b0 2-inch zenith mirror, 2-to-1.25-inch eyepiece adapter and dust caps - ideal for comfortable upright viewing with refractors, Schmidt-Cassegrain and Maksutov telescopes. \u00a0","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\/12\/Skywatcher-Diagonaal-spiegel-90%C2%B0-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/12\/Skywatcher-Diagonaal-spiegel-90%C2%B0-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/12\/Skywatcher-Diagonaal-spiegel-90%C2%B0-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/12\/Skywatcher-Diagonaal-spiegel-90%C2%B0-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":34141,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-90-125-zenitprisma-redcat\/","url_meta":{"origin":34220,"position":4},"title":"William Optics 90\u00b0 1.25\u2033 Zenith prism RedCat","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 90\u00b0 comes with silver zenith prism, 1.25\" eyepiece connector, M56 telescope connector and ring clamp - perfect for RedCat 51 nature observation with upright viewing.","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\/11\/William-Optics-90%C2%B0-125-Zenitprisma-RedCat-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Zenitprisma-RedCat-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Zenitprisma-RedCat-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-90%C2%B0-125-Zenitprisma-RedCat-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":34225,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-50mm-1-25-inch-zoeker-rechtopstaand-beeld-90-graden\/","url_meta":{"origin":34220,"position":5},"title":"William Optics 50 mm 1.25\u2033 Viewfinder Upright View 90\u00b0","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 50mm 1.25 comes with aluminum body, spiral focuser, 1.25\" eyepiece port, upright and side-corrected image - ideal for comfortable object-focusing.","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\/11\/William-Optics-50mm-1.25-Zoeker-Oprichten-en-Zijwaarts-kijken-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-50mm-1.25-Zoeker-Oprichten-en-Zijwaarts-kijken-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-50mm-1.25-Zoeker-Oprichten-en-Zijwaarts-kijken-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-50mm-1.25-Zoeker-Oprichten-en-Zijwaarts-kijken-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/34220","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=34220"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/97591"}],"wp:attachment":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=34220"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=34220"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=34220"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=34220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}