{"id":92575,"date":"2026-01-06T12:35:16","date_gmt":"2026-01-06T11:35:16","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=92575"},"modified":"2026-10-13T11:06:00","modified_gmt":"2026-10-13T09:06:00","slug":"omegon-pro-apo-ap-71-490-quadruplet-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/omegon-pro-apo-ap-71-490-quadruplet-ota\/","title":{"rendered":"Omegon Pro APO AP 71\/490 Quadruplet OTA - 71mm Refractor"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\">Omegon Pro APO AP 71\/490 Quadruplet OTA 71mm Refractor: flat field of view and eyepieces in a package<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Omegon Pro AP 71\/490<\/strong> is the most complete compact apochromat from the Pro line: a quadruplet with ED glass and integrated field flattener, supplied with an Amici prism and two eyepieces. Photographing with a flat field straight out of the box, and enjoying visual observation in between: this tube does both without additional purchases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An apochromat converges all colors to a focal point. Stars remain white and point-like, without the purple edges of simple lenses: precisely what a camera sensor would mercilessly reveal.<\/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\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-apochromatische-refractor-Pro-APO-AP-71-490-Quadruplet-OTA-5.jpg\" alt=\"Omegon Pro AP 71\/490 quadruplet refractor\" 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\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-apochromatische-refractor-Pro-APO-AP-71-490-Quadruplet-OTA-3.jpg\" alt=\"The 2.5-inch focuser with 1:10 reduction of the Omegon AP 71\/490\" title=\"\"><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<h4 class=\"wp-block-heading\">Quadruplet with built-in corrector<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The integrated flattener makes separate correctors and extension rings unnecessary: stars remain point-like even in the corners of the sensor. The 2.5-inch focuser with 1:10 reduction allows for fine-tuning focus, even with a full camera train.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With the included 20mm and 8mm eyepieces, you can view star fields, the Moon, and bright nebulae at 25x and 61x, or observe nature during the day using the upright image Amici prism.<\/p>\n<\/div>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading\">Included<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Quadruplet objective lens 71\/490 with ED glass and integrated field flattener<\/li>\n\n\n<li>2.5-inch focuser with 1:10 reduction<\/li>\n\n\n<li>Amici-prisma 1.25 inch<\/li>\n\n\n<li>20 mm and 8 mm eyepieces (1.25 inch)<\/li>\n\n\n<li>Ring terminal with Vixen-style dovetail<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Featured accessories<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The Omegon Powerbank 10k 12V (\u20ac39.90) powers mounts and cameras on the go. The Omegon Pro UHC 2-inch filter (\u20ac89) brings out emission nebulae, and an Omegon Premium Moon filter (\u20ac19.90) dims the bright Moon for visual use.<\/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 those seeking an apochromat that excels at both astrophotography and visual observation. Not for those who primarily photograph and where every gram counts; the AP 40\/180 or the 61\/360 with reducer would then be lighter and more cost-effective. Uncertain between the models? <a href=\"\/en\/telescope-selection-aid\/\">Choice assistant<\/a> helpt. More Omegon is on the <a href=\"\/en\/brands\/omegon\/\">brand page<\/a>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Specifications<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Opening<\/td><td>71 mm<\/td><\/tr><tr><td>Focal length<\/td><td>490 mm<\/td><\/tr><tr><td>Opening ratio<\/td><td>f\/6,9<\/td><\/tr><tr><td>Optical design<\/td><td>Quadruplet with ED glass and integrated flattener<\/td><\/tr><tr><td>Focuser<\/td><td>2.5 inch with a 1:10 reduction<\/td><\/tr><tr><td>Magnification included<\/td><td>25x and 61x<\/td><\/tr><tr><td>Execution<\/td><td>OTA (loose tube)<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"<p><strong>This is just the tube (OTA), without mounting and tripod.<\/strong> You can choose the appropriate mounting and the accessories that come with it below.<\/p>\n<p>The Omegon Pro AP 71\/490 comes with an integrated field flattener, 2.5-inch focuser with 1:10 reduction, ring clamps, Vixen dovetail, Amici prism, and 8mm and 20mm eyepieces: photography and visual in one package.<\/p>","protected":false},"featured_media":98930,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[126],"product_cat":[51,428,3175,567],"product_tag":[3352,3353],"class_list":["post-92575","product","type-product","status-publish","has-post-thumbnail","product_brand-omegon","product_cat-telescopen","product_cat-telescopen-voor-astrofotografie","product_cat-refractor-ota","product_cat-refractor-telescopen","product_tag-sterrenkijker","product_tag-sterrenkijkers","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":[90626,27732,32949,25687,26595,93445,25035,24780],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":92586,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-apo-doubleed-ap-40-180-sixtuplet-ota\/","url_meta":{"origin":92575,"position":0},"title":"Omegon Pro APO DoubleED AP 40\/180 Sixtuplet OTA - 40mm Refractor","author":"Info telescoop","date":"06-01-2026","format":false,"excerpt":"This is just the tube (OTA), without mounting and tripod. You can choose the appropriate mounting and the accessories that come with it below. The Omegon Pro AP 40\/180 comes with integrated corrector, quadruple ED optics, helical focuser, M48 connection, rotating mechanism, dew shield, Vixen owl tail and tube rings: the ultra-compact travel astrograph.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-apochromatische-refractor-Pro-APO-DoubleED-AP-40-180-Quadruplet-OTA-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":91966,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-72-432-apo-refractor-photography-scope-ota\/","url_meta":{"origin":92575,"position":1},"title":"Omegon Pro 72\/432 APO Refractor Photography Scope OTA","author":"","date":"02-01-2026","format":false,"excerpt":"This is just the tube (OTA), without mounting and tripod. You can choose the appropriate mounting and the accessories that come with it below. The Omegon Pro APO AP 72\/432 comes with a double ED lens, a fine-tuning focus unit, a 2-inch connection, SC threaded screws, and a carrying case: telescope, spotting scope, and a telephoto lens in one.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-Photography-Scope-72-432-ED-OTA-11.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":107792,"url":"https:\/\/www.telescoop.nl\/en\/televue-np-101is-101-540-apochromat-refractor\/","url_meta":{"origin":92575,"position":2},"title":"TeleVue NP-101is \u2013 101\/540 Apochromatic Refractor","author":"Info telescoop","date":"29-04-2026","format":false,"excerpt":"This is just the tube (OTA), without mounting and tripod. You can choose the appropriate mounting and the accessories that come with it below. TeleVue NP-101is: Nagler-Petzval quadruplet 101\/540 f\/5.3 with flat field without a flattener and motorized Imaging System focus. Supplied with tube rings and transport case.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Apochromatische refractor AP 101\/540 NP-101is Imaging System OTA witte optische buis met zwarte dauwkap en focuser, afgebeeld met transportkoffer, afdekdop en detail van adapterringen","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Apochromatische-refractor-AP-101-540-NP-101is-Imaging-System-OTA-3.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Apochromatische-refractor-AP-101-540-NP-101is-Imaging-System-OTA-3.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Apochromatische-refractor-AP-101-540-NP-101is-Imaging-System-OTA-3.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Apochromatische-refractor-AP-101-540-NP-101is-Imaging-System-OTA-3.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":91980,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-104-650-apo-refractor-ota-field-flattener\/","url_meta":{"origin":92575,"position":3},"title":"Omegon Pro 104\/650 APO Refractor OTA + 2\u2033 Field Flattener","author":"","date":"02-01-2026","format":false,"excerpt":"This is the tube (OTA) only, without mounting and tripod. The appropriate mounting and the accessories that come with it can be selected below. The Omegon Pro APO AP 104\/650 comes with the FPL-53\/FPL-51 triplet lens, 2.9 inch dualspeed focuser, field flattener, 1.25\/2 inch adapter and aluminum transport case: the complete corrected flagship.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-104-650-ED-OTA-2-Field-Flattener-16.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33684,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-ota\/","url_meta":{"origin":92575,"position":4},"title":"William Optics AP 71\/350 71 Apochromatic Refractor RedCat OTA","author":"","date":"14-11-2025","format":false,"excerpt":"This is just the tube (OTA), without mounting and tripod. You can choose the appropriate mounting and the accessories that come with it below. William Optics RedCat 71: Petzval achromatic 71\/350 f\/4.9 with flat image to full-frame. Supplied with Bahtinov mask in the lens cap, Vixen\/Arca owl tail 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-OTA-14.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33699,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-wifd\/","url_meta":{"origin":92575,"position":5},"title":"William Optics AP 71\/350 71 Apochromatic Refractor RedCat WIFD OTA","author":"","date":"14-11-2025","format":false,"excerpt":"This is just the tube (OTA), without mounting and tripod. You can choose the appropriate mounting and the accessories that come with it below. William Optics RedCat 71 WIFD: Petzval-apochromate 71\/350 f\/4.9 with internal WIFD focus. Flat, color-pure image up to full-frame. Supplied 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":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/92575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=92575"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/98930"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=92575"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=92575"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=92575"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=92575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}