{"id":33699,"date":"2025-11-14T13:41:38","date_gmt":"2025-11-14T12:41:38","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=33699"},"modified":"2026-09-10T14:45:35","modified_gmt":"2026-09-10T12:45:35","slug":"william-optics-ap-71-350-71-apochromatic-refractor-redcat-wifd","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-wifd\/","title":{"rendered":"William Optics AP 71\/350 71 Apochromatic Refractor RedCat WIFD OTA"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>RedCat 71 with internal focuser: compact power for full-frame<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>William Optics RedCat 71 WIFD<\/strong> combines the proven 71\/350 Petzval optics with the internal WIFD focuser. You get a bright, sharp, and color-pure image for astrophotography and nature photography, with a balance that remains stable because nothing moves outside the tube.<\/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=\"33700\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-71-350-71-Apochromatische-refractor-RedCat-WIFD-1.jpg\" alt=\"William Optics RedCat 71 WIFD apochromatic astrograph, field flattener\" class=\"wp-image-33700\" 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-71-350-71-Apochromatische-refractor-RedCat-WIFD-8.jpg\" alt=\"The RedCat 71 WIFD with internal focuser and prism beam splitter\" class=\"wp-image-33702\" 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\">Fast, tight, and without sagging<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">With f\/4.9, the lens captures a lot of light: shorter exposures, less noise, and more detail. The image remains flat all the way to the corners of a full-frame sensor, without a separate flattener. The WIFD focuser tolerates heavy camera setups without shifting, and the Bahtinov mask in the lens hood allows for precise focusing.<\/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>Optical tube RedCat 71\/350 with WIFD focuser<\/li>\n\n\n\n<li>Integrated Bahtinov mask in the lens hood<\/li>\n\n\n\n<li>Arca-Swiss and Vixen-Style dovetail<\/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 32mm Guidescope<\/a> (159 euros) completes the setup for long exposures. William Optics' M48 camera adapters are available for common mounts; choose the variant for your camera.<\/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\">For: Astrophotographers who want the RedCat 71 optics with the latest internal focuser, also as a travel and nature lens. Not for: Those who want to observe visually with eyepieces; the ZenithStar line is the logical choice for that.<\/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>Apochromat, Petzval<\/td><\/tr><tr><td>Opening<\/td><td>71 mm<\/td><\/tr><tr><td>Focal length<\/td><td>350 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>Field of view<\/td><td>Flat to full-frame<\/td><\/tr><tr><td>Focus assist<\/td><td>Integrated Bahtinov mask<\/td><\/tr><tr><td>Attachment<\/td><td>Arca-Swiss and Vixen-Style<\/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 71 WIFD: Petzval apochromat 71\/350 f\/4.9 with internal WIFD focuser. Flat, color-pure image up to full-frame. Delivered with Bahtinov mask, Arca\/Vixen dovetail, and carrying case.<\/p>","protected":false},"featured_media":97234,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[51,428,3175,567],"product_tag":[],"class_list":["post-33699","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescopen","product_cat-telescopen-voor-astrofotografie","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":[34142,15860,33941,33946],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":33684,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-ota\/","url_meta":{"origin":33699,"position":0},"title":"William Optics AP 71\/350 71 Apochromatic Refractor RedCat OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics RedCat 71: Petzval apochromat 71\/350 f\/4.9 with a flat field up to full-frame. Includes Bahtinov mask in the lens cap, Vixen\/Arca dovetail, 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-71-350-71-Apochromatische-refractor-RedCat-OTA-14.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33664,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-51-250-apochromatische-refractor-spacecat-wifd-ota\/","url_meta":{"origin":33699,"position":1},"title":"William Optics AP 51\/250 Apochromatic Refractor SpaceCat WIFD OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics SpaceCat 51 WIFD: the same f\/4.9 Petzval optics as the RedCat 51 in the SpaceCat version, featuring an internal focuser. 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