{"id":33676,"date":"2025-11-14T13:08:34","date_gmt":"2025-11-14T12:08:34","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=33676"},"modified":"2026-03-03T20:23:04","modified_gmt":"2026-03-03T19:23:04","slug":"william-optics-ap-61-300-61-apochromatic-refractor-redcat-ota","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/william-optics-ap-61-300-61-apochromatische-refractor-redcat-ota\/","title":{"rendered":"William Optics AP 61\/300 61 Apochromatic refractor RedCat OTA"},"content":{"rendered":"<h3 class=\"wp-block-heading\">Small, powerful and ready for your best photos<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>William Optics AP 61\/300<\/strong> is built for photographers who want a compact tube with true premium image quality.You get a clear, tight and flat image across the entire frame.So you can work faster, focus easier and get sharper results instantly.<\/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 aligncenter size-large\"><img decoding=\"async\" data-id=\"33677\" src=\"https:\/\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-61-300-61-Apochromatische-refractor-RedCat-OTA-1.jpg\" alt=\"William Optics AP 61\/300 61 complete set with red OTA, prism bar, tube rings, Bahtinov mask and lens caps on white background\" class=\"wp-image-33677\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Flat image without loose accessories<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Petzval design does all the hard work for you.Four lenses provide a flat and color-clear image, so you can <strong>no flattener<\/strong> Just plug in your camera, focus and go, providing peace of mind and consistent image quality night after night.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Focusing is smooth and precise<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With the internal focuser, you gently rotate the image into focus without the camera wobbling.The tilt adapter helps you perfectly straighten your sensor.This keeps your image sharp to all angles, even with a full-frame camera.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" data-id=\"33678\" src=\"https:\/\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-61-300-61-Apochromatische-refractor-RedCat-OTA-2.jpg\" alt=\"William Optics AP 61\/300 61 top view of carbon fiber tube with focuser mounted and masks disconnected next to it\" class=\"wp-image-33678\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Fits almost anywhere<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The prism bar gives you three mounting options:Arca-Swiss, Vixen or regular tripod screw.So you snap the telescope onto a photo tripod as easily as a star tracker.Ideal for outdoor work and travel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Smart design with everything included<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The RedCat 61 comes with bag, rings, prism bar and Bahtinov mask.The mask is neatly hidden in the dew cap, so you always have it with you.You focus quickly and precisely, even in the dark.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">For night, nature and everything in between<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This telescope works great for nebulae, star fields and night pano.But it is also suitable for nature photography thanks to its short focal length and fast f\/4.9 aperture.You get clear images with high detail, without long exposure times.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>Specifications<\/strong><\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Optics<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>Type<\/td><td>Refractor<\/td><\/tr><tr><td>Design<\/td><td>Apochromat<\/td><\/tr><tr><td>Aperture (mm)<\/td><td>61<\/td><\/tr><tr><td>Focal length (mm)<\/td><td>300<\/td><\/tr><tr><td>Focal Ratio (f\/)<\/td><td>4,9<\/td><\/tr><tr><td>Resolution<\/td><td>2,26\u2033<\/td><\/tr><tr><td>Limit value (mag)<\/td><td>12,3<\/td><\/tr><tr><td>Light output<\/td><td>80<\/td><\/tr><tr><td>Max. useful magnification<\/td><td>122\u00d7<\/td><\/tr><tr><td>Tube weight (kg)<\/td><td>3,4<\/td><\/tr><tr><td>Tube length (mm)<\/td><td>365<\/td><\/tr><tr><td>Tube material<\/td><td>Aluminum<\/td><\/tr><tr><td>Coating<\/td><td>Multiple<\/td><\/tr><tr><td>Tube construction<\/td><td>Full tube<\/td><\/tr><tr><td>Dew cap diameter (mm)<\/td><td>80<\/td><\/tr><tr><td>Lens Design<\/td><td>Quadruplet<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Focuser<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>Tilt adapter<\/td><td>Yes<\/td><\/tr><tr><td>Design<\/td><td>Internal<\/td><\/tr><tr><td>Camera connection<\/td><td>M48<\/td><\/tr><tr><td>Backfocus (mm)<\/td><td>57<\/td><\/tr><tr><td>Free opening (mm)<\/td><td>45<\/td><\/tr><tr><td>Rotatable<\/td><td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Mount<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>Design<\/td><td>OTA<\/td><\/tr><tr><td>Type of mount<\/td><td>Without<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Included accessories<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Section<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>Dew cap<\/td><td>Yes<\/td><\/tr><tr><td>Transport bag<\/td><td>Yes<\/td><\/tr><tr><td>Bahtinov mask<\/td><td>Yes<\/td><\/tr><tr><td>Dovetail<\/td><td>Arca-Swiss &amp; Vixen-Style<\/td><\/tr><tr><td>Tripod screw<\/td><td>Yes<\/td><\/tr><tr><td>Corrector<\/td><td>Integrated<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">General<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>Series<\/td><td>Cat<\/td><\/tr><tr><td>Color<\/td><td>Red<\/td><\/tr><tr><td>Application<\/td><td>Astrophotography, Moon &amp; Planets, Nature, Deep-sky<\/td><\/tr><tr><td>Sun<\/td><td>No (only with appropriate filters)<\/td><\/tr><tr><td>Recommended for<\/td><td>Advanced<\/td><\/tr><tr><td>Observatory use<\/td><td>No<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"<p>William Optics AP 61\/300 61 comes with integrated corrector, field rotator, carrying case, Bahtinov mask, tube rings and Arca\/Vixen prism bar - compact quadruplet for razor-sharp astrophotos and nature shots. \u00a0<\/p>","protected":false},"featured_media":97213,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[51,567],"product_tag":[],"class_list":["post-33676","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescopen","product_cat-refractors","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":33869,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-zenithstar-61-360-apo-ii-ota\/","url_meta":{"origin":33676,"position":0},"title":"William Optics ZenithStar 61\/360 APO II OTA","author":"","date":"15-11-2025","format":false,"excerpt":"William Optics AP 61\/360 ZS61 II wordt geleverd met een UniGuide 32mm guidescope, een flattener, buisringen, Arca-Swiss & Vixen-style zwaluwstaart, 2\" naar 1,25\" adapter en een zachte draagtas. \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-61-360-ZS61-II-Apochromatische-refractor-ZenithStar-OTA-2-1.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-AP-61-360-ZS61-II-Apochromatische-refractor-ZenithStar-OTA-2-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-61-360-ZS61-II-Apochromatische-refractor-ZenithStar-OTA-2-1.jpg?resize=525%2C300&ssl=1 1.5x, 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Bag\u00a0","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 61 comes with sturdy nylon exterior, zipper closure and handles - designed for use with original foam insert from your ZenithStar 61 telescope.","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-61-ZenithStar-Transporttas-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-61-ZenithStar-Transporttas-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-61-ZenithStar-Transporttas-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-61-ZenithStar-Transporttas-1.jpg?resize=700%2C400&ssl=1 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