{"id":34141,"date":"2025-11-17T13:22:06","date_gmt":"2025-11-17T12:22:06","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34141"},"modified":"2026-03-12T08:31:42","modified_gmt":"2026-03-12T07:31:42","slug":"william-optics-90-125-zenith-prism-redcat","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/william-optics-90-125-zenitprisma-redcat\/","title":{"rendered":"William Optics 90\u00b0 1.25\u2033 Zenith prism RedCat"},"content":{"rendered":"

William Optics 90\u00b0 - 1.25\u2033 Zenith prism for RedCat 51<\/strong><\/h1>\n\n\n\n

The William Optics 90\u00b0<\/strong> 1.25\u2033 zenith prism is designed specifically for the William Optics RedCat 51 (AP 51\/250) apochromatic refractor. This high-quality focusing prism delivers a true-to-life, bright and comfortable image - ideal for both nature observation and viewing the moon and bright objects in the night sky.<\/p>\n\n\n\n

\"William<\/figure>\n\n\n\n

Thanks to the precision-BAK-4 glass with anti-reflex coating, the prism offers excellent light transmission and high-contrast viewing without unwanted reflections. The matte black interior prevents stray light, keeping your image calm and making fine details more visible.<\/p>\n\n\n\n

\"William<\/figure>\n\n\n\n

With this William Optics 90\u00b0<\/strong> prism you get an upright and horizontally correct image, making it perfect for observations where orientation is important - from birds and landscapes to the moon in realistic position.<\/p>\n\n\n\n

The aluminum housing in elegant silver finish makes it not only durable, but also stylishly fitting for the RedCat series.<\/p>\n\n\n\n

Key features<\/strong><\/h2>\n\n\n\n
    \n
  • Specially designed for William Optics RedCat 51<\/strong><\/li>\n\n\n\n
  • Upright and correctly horizontal image display<\/strong><\/li>\n\n\n\n
  • BAK-4 glass with anti-reflex coating for clear, high-contrast image<\/strong><\/li>\n\n\n\n
  • Matte black interior against stray light<\/strong><\/li>\n\n\n\n
  • Ring clamp for firm and secure eyepiece clamping<\/strong><\/li>\n\n\n\n
  • Durable aluminum housing in silver color<\/strong><\/li>\n<\/ul>\n\n\n\n

    Specifications<\/strong><\/h2>\n\n\n\n

    Capacity<\/strong><\/h3>\n\n\n\n
    Feature<\/th>Description<\/th><\/tr><\/thead>
    Telescope connection<\/td>M56<\/td><\/tr>
    Ocular connection<\/td>1,25\u2033<\/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>
    Horizontally correct orientation<\/td>Yes<\/td><\/tr>
    Ring clamp<\/td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    General<\/strong><\/h3>\n\n\n\n
    Feature<\/th>Description<\/th><\/tr><\/thead>
    Type<\/td>Divergent optics<\/td><\/tr>
    Design<\/td>Zenith prism<\/td><\/tr>
    Color<\/td>Silver<\/td><\/tr>
    Material<\/td>Aluminum<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    <\/p>","protected":false},"excerpt":{"rendered":"

    William Optics 90\u00b0 comes with silver zenith prism, 1.25\u2033 eyepiece connector, M56 telescope connector and ring clamp - perfect for RedCat 51 nature observation with upright viewing.<\/p>","protected":false},"featured_media":97580,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[56,591,3142],"product_tag":[],"class_list":["post-34141","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":34142,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-90-125-zenitprisma-cat-51-wifd\/","url_meta":{"origin":34141,"position":0},"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":33659,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-ap-51-250-apochromatische-refractor-redcat-wifd\/","url_meta":{"origin":34141,"position":1},"title":"William Optics AP 51\/250 Apochromatic refractor RedCat WIFD","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics AP 51\/250 wordt geleverd met een beschermende nylon draagtas, ge\u00efntegreerd Bahtinov-masker en een veelzijdige Arca-Swiss & Vixen-stijl prismabalk \u2013 perfect voor astrofotografen die een compacte, kleurzuivere en hoogwaardige apochromatische refractor zoeken. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar 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OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics AP 91\/448 91 comes with a protective nylon carrying case, a Bahtinov mask integrated into the objective cap, M48 and M54 camera adapters and a dovetail rod suitable for Arca-Swiss and Losmandy clamps. \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-AP-91-448-91-Apochromatische-refractor-RedCat-WIFD-OTA-4.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-AP-91-448-91-Apochromatische-refractor-RedCat-WIFD-OTA-4.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-91-448-91-Apochromatische-refractor-RedCat-WIFD-OTA-4.jpg?resize=525%2C300&ssl=1 1.5x, 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Shoe","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics RedCat comes with Vixen-style accessory shoe, integrated carrying handle, tracking scope mounting option and screws - matching RedCat design.","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-RedCat-Vixen-Style-Accessoireschoen-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-RedCat-Vixen-Style-Accessoireschoen-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-RedCat-Vixen-Style-Accessoireschoen-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-RedCat-Vixen-Style-Accessoireschoen-1.jpg?resize=700%2C400&ssl=1 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