{"id":33729,"date":"2025-11-14T14:36:19","date_gmt":"2025-11-14T13:36:19","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=33729"},"modified":"2026-07-18T13:21:10","modified_gmt":"2026-07-18T11:21:10","slug":"william-optics-redcat-91-448-apo-wifd-red-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-redcat-91-448-apo-wifd-red-ota\/","title":{"rendered":"William Optics RedCat 91\/448 APO WIFD Red OTA"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>RedCat 91: de klassieke rode uitvoering van de Cat 91<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>William Optics RedCat 91 WIFD<\/strong> brengt de Cat 91-optiek in de klassieke rode RedCat-uitvoering. Het Petzval-ontwerp met FPL53- en FPL51-glas geeft een kleurzuiver, scherp beeld over het hele veld, tot full-frame formaat. Geschikt voor astrofotografie \u00e9n natuurfotografie.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" data-id=\"33730\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-91-448-91-Apochromatische-refractor-RedCat-WIFD-OTA-4.jpg\" alt=\"William Optics RedCat 91 WIFD apochromatische astrograaf, totaalbeeld\" class=\"wp-image-33730\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8d39b2df wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-91-448-91-Apochromatische-refractor-RedCat-WIFD-OTA-1.jpg\" alt=\"De RedCat 91 WIFD met M48- en M54-adapters\" class=\"wp-image-33733\" title=\"\"><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h4 class=\"wp-block-heading\">Snelle optiek, stevige basis<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Met f\/4,9 en 448 mm brandpunt vang je veel licht: korte belichtingen, minder ruis en meer detail in middelgrote nevels en sterrenstelsels. De M48- en M54-camera-adapters sluiten de gangbare cameratreinen direct aan, en de interne WIFD-focuser houdt de balans constant. Het Bahtinov-masker zit in de objectiefdop.<\/p>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>In the box<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Optische buis Cat 91\/448 met WIFD-focuser<\/li>\n\n\n\n<li>M48- en M54-camera-adapters<\/li>\n\n\n\n<li>Zwaluwstaartstang<\/li>\n\n\n\n<li>Ge\u00efntegreerd Bahtinov-masker in de objectiefdop<\/li>\n\n\n\n<li>Nylon tote bag<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Featured accessories<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A <a href=\"https:\/\/www.telescoop.nl\/en\/telescope-accessories\/astro-photography\/other-astrophotography-accessories\/\">William Optics UniGuide 50mm Guidescope<\/a> (vanaf 189 euro) is de passende gids voor deze klasse. De M48- en M54-aansluitingen nemen de gangbare camera-adapters van William Optics direct aan.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">For whom yes, for whom no<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Wel: astrofotografen die de Cat 91-optiek in de herkenbare rode uitvoering willen, met een complete basisuitrusting. Niet: wie rotator en kantelflens standaard wil; de BlackCat 91 WIFD levert die er voor hetzelfde bedrag bij.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Specifications<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Optical design<\/td><td>Apochromaat, Petzval (FPL53 en FPL51)<\/td><\/tr><tr><td>Opening<\/td><td>91 millimeters<\/td><\/tr><tr><td>Focal length<\/td><td>448 mm<\/td><\/tr><tr><td>Opening ratio<\/td><td>f\/4,9<\/td><\/tr><tr><td>Focuser<\/td><td>WIFD (intern)<\/td><\/tr><tr><td>Camera connection<\/td><td>M48 en M54<\/td><\/tr><tr><td>Field of view<\/td><td>Flat to full-frame<\/td><\/tr><tr><td>Execution<\/td><td>OTA (loose tube)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Unsure about the right tube for your camera and mount? The <a href=\"https:\/\/www.telescoop.nl\/en\/telescope-selection-aid\/\">telescope selection aid<\/a> helps you choose. Also view all <a href=\"https:\/\/www.telescoop.nl\/en\/telescopes\/refracting-telescopes\/\">Refracting telescopes<\/a> and the full range of <a href=\"https:\/\/www.telescoop.nl\/en\/brands\/william-optics\/\">William Optics<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>William Optics RedCat 91 WIFD: Petzval-apochromaat 91\/448 f\/4,9 in de rode uitvoering, met M48\/M54-adapters en interne focuser. Geleverd met zwaluwstaartstang, Bahtinov-masker en draagtas.<\/p>","protected":false},"featured_media":97260,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[51,428,531,3175,567],"product_tag":[],"class_list":["post-33729","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescopen","product_cat-telescopen-voor-astrofotografie","product_cat-gevorderd","product_cat-refractor-ota","product_cat-refractor-telescopen","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":33717,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-blackcat-91-448-apo-wifd-ota\/","url_meta":{"origin":33729,"position":0},"title":"William Optics BlackCat 91\/448 APO WIFD OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics BlackCat 91 WIFD: Petzval-apochromaat 91\/448 f\/4,9 met rotator, kantelflens en M48\/M54-adapters. 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Delivered with Bahtinov mask, prism rail, and carrying bag.","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\/11\/William-Optics-AP-51250-Apochromatische-refractor-RedCat-WIFD-4.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33652,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-51-178-apochromatische-refractor-minicat-wifd-ota\/","url_meta":{"origin":33729,"position":3},"title":"William Optics AP 51\/178 Apochromatic refractor MiniCat WIFD OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics MiniCat 51\/178 WIFD: ultra-compact f\/3.5 apochromat with internal focuser for wide-field astrophotography. Supplied with Bahtinov mask, dew shield, Arca\/Vixen dovetail, and carrying case.","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\/11\/William-Optics-AP-51178-Apochromatische-refractor-MiniCat-WIFD-OTA-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33699,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-wifd\/","url_meta":{"origin":33729,"position":4},"title":"William Optics AP 71\/350 71 Apochromatic Refractor RedCat WIFD OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics RedCat 71 WIFD: Petzval-apochromaat 71\/350 f\/4,9 met interne WIFD-focuser. Vlak, kleurzuiver beeld tot full-frame. 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