{"id":33684,"date":"2025-11-14T13:23:48","date_gmt":"2025-11-14T12:23:48","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=33684"},"modified":"2026-09-10T14:45:34","modified_gmt":"2026-09-10T12:45:34","slug":"william-optics-ap-71-350-71-apochromatic-refractor-redcat-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-ota\/","title":{"rendered":"William Optics AP 71\/350 71 Apochromatic Refractor RedCat OTA"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>The classic RedCat 71: bright and color-pure from the first shot<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>William Optics RedCat 71<\/strong> It provides a clear, flat, and color-accurate image from the very first shot. With a 71mm aperture and 350mm focal length, you can photograph larger nebulae and star fields with true image scale, and at f\/4.9, exposures remain short. Mount your camera, focus smoothly, and begin: during the day for nature, after sunset under the stars.<\/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=\"33685\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-71-350-71-Apochromatische-refractor-RedCat-OTA-1.jpg\" alt=\"William Optics RedCat 71 Apochromatic Astrograph, Full Frame\" class=\"wp-image-33685\" 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-OTA-12.jpg\" alt=\"The RedCat 71 with a Bahtinov mask in the lens cap\" class=\"wp-image-33688\" 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\">Petzval image without loose accessories<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The Petzval design keeps the image flat all the way to the corners of a full-frame sensor, without a separate flattener. The Bahtinov mask in the lens cap allows for precise focusing, and the Vixen\/Arca-Swiss dovetail fits directly onto mounts and tripod heads.<\/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<\/li>\n\n\n\n<li>Integrated Bahtinov mask in the lens cap<\/li>\n\n\n\n<li>Vixen and Arca-Swiss 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\">Suitable for: Astrophotographers who prefer the classic RedCat 71 model with an external focuser. Not suitable for: Those who want the latest internal focuser; in that case, consider the RedCat 71 WIFD, which combines the same optics with the WIFD system.<\/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>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>Vixen and Arca-Swiss<\/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: 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.<\/p>","protected":false},"featured_media":97220,"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-33684","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":[34141,15860,33941,33946],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":33699,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-wifd\/","url_meta":{"origin":33684,"position":0},"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 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.","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-WIFD-9.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33813,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-granturismo-71-420-apo-ota\/","url_meta":{"origin":33684,"position":1},"title":"William Optics GranTurismo 71\/420 APO OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics GranTurismo 71: FPL-53 triplet apochromatic 71\/420 f\/5.9 with 2.5-inch rack-and-pinion focuser (1:10). Supplied with Bahtinov mask, adapters, Vixen dovetail, handle, and transport 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-71-420-GT-71-Apochromatische-refractor-Gran-Turismo-3.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":33684,"position":2},"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. Supplied with a Bahtinov mask, dovetail bar, 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-51250-Apochromatische-refractor-SpaceCat-WIFD-OTA-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33659,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-51-250-apochromatische-refractor-redcat-wifd\/","url_meta":{"origin":33684,"position":3},"title":"William Optics AP 51\/250 Apochromatic Refractor RedCat WIFD OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics RedCat 51 WIFD: the most famous compact astrograph with a four-element Petzval optical design (FPL53\/FPL51) and internal focuser. Flat, color-corrected image up to full-frame. 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":33729,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-redcat-91-448-apo-wifd-red-ota\/","url_meta":{"origin":33684,"position":4},"title":"William Optics RedCat 91\/448 APO WIFD Red OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics RedCat 91 WIFD: Petzval apochromat 91\/448 f\/4.9 in the red finish, with M48\/M54 adapters and internal focuser. 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