{"id":33717,"date":"2025-11-14T14:19:40","date_gmt":"2025-11-14T13:19:40","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=33717"},"modified":"2026-07-18T13:21:10","modified_gmt":"2026-07-18T11:21:10","slug":"william-optics-blackcat-91-448-apo-wifd-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-blackcat-91-448-apo-wifd-ota\/","title":{"rendered":"William Optics BlackCat 91\/448 APO WIFD OTA"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>BlackCat 91: de complete imaging-uitvoering<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>William Optics BlackCat 91 WIFD<\/strong> is de meest complete uitvoering van de Cat 91-klasse. De 91 mm Petzval-optiek met FPL53- en FPL51-glas levert een kleurzuiver, scherp beeld tot aan de randen van een full-frame sensor, en de meegeleverde rotator en kantelflens geven volledige controle over compositie en sensoruitlijning.<\/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=\"33718\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-91-448-91-Apochromatische-refractor-BlackCat-WIFD-OTA-11.jpg\" alt=\"William Optics BlackCat 91 WIFD apochromatische astrograaf, totaalbeeld\" class=\"wp-image-33718\" 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-BlackCat-WIFD-OTA-7.jpg\" alt=\"De BlackCat 91 met rotator en kantelflens\" class=\"wp-image-33722\" 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\">Alles voor de perfecte opname<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Met f\/4,9 en 448 mm brandpunt fotografeer je middelgrote nevels en sterrenstelsels met korte belichtingen. De rotator draait de compositie zonder de scherpstelling te raken, de kantelflens corrigeert sensorkanteling, en de M48- en M54-adapters sluiten vrijwel elke cameratrein direct aan. De interne WIFD-focuser draagt dat alles zonder doorzakken.<\/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>Rotator<\/li>\n\n\n\n<li>Kantelflens<\/li>\n\n\n\n<li>M48- en M54-adapters<\/li>\n\n\n\n<li>Zwaluwstaartstang<\/li>\n\n\n\n<li>Integrated Bahtinov mask<\/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: gevorderde astrofotografen die maximale controle willen over compositie en sensoruitlijning, in de zwarte uitvoering. Niet: wie dezelfde optiek zoekt zonder rotator en kantelflens; de RedCat 91 WIFD is dan de eenvoudiger uitgeruste keuze.<\/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>Rotator en kantelflens<\/td><td>Included<\/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 BlackCat 91 WIFD: Petzval-apochromaat 91\/448 f\/4,9 met rotator, kantelflens en M48\/M54-adapters. Kleurzuiver, vlak beeld tot full-frame. Geleverd met zwaluwstaartstang, Bahtinov-masker en draagtas.<\/p>","protected":false},"featured_media":97249,"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-33717","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":33729,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-redcat-91-448-apo-wifd-red-ota\/","url_meta":{"origin":33717,"position":0},"title":"William Optics RedCat 91\/448 APO WIFD Red OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics RedCat 91 WIFD: Petzval-apochromaat 91\/448 f\/4,9 in de rode uitvoering, met M48\/M54-adapters en interne focuser. 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