{"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":"2026-05-18T16:10:51","modified_gmt":"2026-05-18T14:10:51","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":"<h3 class=\"wp-block-heading\">Compact, bright and made for your best photos<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>William Optics AP 71\/350 71<\/strong> gives you a clear, flat and color-clean image from the first shot.It is small, light and ready for photography right away.You set your camera on it, focus quietly and you can start right away.Perfect for those who want to take sharp images without the hassle, both during the day and 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 aligncenter 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 AP 71\/350 71 apochromatic refractor in red with the objective cap placed next to it.\" class=\"wp-image-33685\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Fast lens for short exposures<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The f\/4.9 aperture lets in a lot of light, so you can <strong>shorter exposure<\/strong> and get less noise.Useful for nebulae, star fields and animals that move quickly.Your images remain clear and have nice details, even when the light gets weaker.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Flat image without additional flattener<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The Petzval design uses four lenses that correct the image for you.You get a <strong>Flat field of view of more than 45 mm<\/strong>, Ideal for full-frame cameras, there is no need to buy or set up a separate corrector, which saves time and gives you consistent quality.<\/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=\"33688\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-71-350-71-Apochromatische-refractor-RedCat-OTA-12.jpg\" alt=\"William Optics AP 71\/350 71 detail shot of the ring clamp with the Arca-Swiss &amp; Vixen-style dovetail.\" class=\"wp-image-33688\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Focusing is easy<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The helical focuser works smoothly and precisely.You turn the ring and the image slides quietly into focus, without shifting your camera.Even with a heavier camera, everything remains stable.The tilt adapter helps you straighten your sensor nicely, keeping corners sharp.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fits almost any mount<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The long prism bar can be used three ways:Arca-Swiss, Vixen or regular tripod screw.Useful if you often switch between photo tripod, star tracker or astronomical mount.You attach it quickly and without fuss.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cleverly designed for real photographers<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The built-in Bahtinov mask is neatly hidden in the dew cap.You snap it out, focus and slide it back in.The included carrying case makes it easy to take the telescope anywhere.You get a solidly built instrument with William Optics' well-known, beautiful finish.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">For stars and nature<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The AP 71\/350 does a great job on large nebulae, star fields and deep-sky panoramas.But birds, animals and landscapes also get a clear, sharp image.You're basically buying one instrument that can do it all.<\/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>71<\/td><\/tr><tr><td>Focal length (mm)<\/td><td>350<\/td><\/tr><tr><td>Focal Ratio (f\/)<\/td><td>4,9<\/td><\/tr><tr><td>Resolution<\/td><td>1,94\u2033<\/td><\/tr><tr><td>Limit value (mag)<\/td><td>12,3<\/td><\/tr><tr><td>Light output<\/td><td>100<\/td><\/tr><tr><td>Max. useful magnification<\/td><td>142\u00d7<\/td><\/tr><tr><td>Tube weight (kg)<\/td><td>2,8<\/td><\/tr><tr><td>Tube length (mm)<\/td><td>335<\/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>98<\/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>Helical<\/td><\/tr><tr><td>Camera connection<\/td><td>M48<\/td><\/tr><tr><td>Backfocus (mm)<\/td><td>59<\/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>Observation goals<\/td><td>Astrophotography, Moon &amp; Planets, Nature observation, 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 71\/350 71 comes with a protective nylon carrying case, a Vixen\/Arca-Swiss dovetail and a Bahtinov mask integrated into the objective cap - ideal for astrophotographers who want perfect focus and portability. \u00a0<\/p>","protected":false},"featured_media":97220,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[51,3175,567],"product_tag":[],"class_list":["post-33684","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescopen","product_cat-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":105023,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-blitz-50-base\/","url_meta":{"origin":33684,"position":0},"title":"Levenhuk Blitz 50 BASE \u2013 50\/600 Refractor","author":"Abdullah Ibrar","date":"01-04-2026","format":false,"excerpt":"The Levenhuk Blitz 50 BASE \u2013 50\/600 Refractor comes with 6mm and 20mm eyepieces, a 3x Barlow lens, a 5x24 finder scope, a diagonal mirror, and an aluminum tripod. 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