{"id":91868,"date":"2026-01-01T19:21:43","date_gmt":"2026-01-01T18:21:43","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=91868"},"modified":"2026-10-13T11:06:06","modified_gmt":"2026-10-13T09:06:06","slug":"omegon-ac-80-400-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/omegon-ac-80-400-ota\/","title":{"rendered":"Omegon AC 80\/400 OTA"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\">Omegon AC 80\/400 OTA: the standalone wide-field optical tube for custom setups<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Omegon AC 80\/400 OTA<\/strong> is a standalone telescope tube without a mount: 80 mm aperture, 400 mm focal length (f\/5), and a weight that any mount can handle. Ideal as a wide-field tube on an existing setup, as a spotting scope, or as a lightweight travel tube on a photo tripod.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The achromatic doublet lens with multi-coating combines two types of glass to reduce chromatic aberration. At high magnification, a thin color fringe remains visible around bright objects; this is characteristic of this type of lens and does not interfere with normal use.<\/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-Telescoop-AC-80-400-OTA-1.jpg\" alt=\"Omegon AC 80\/400 OTA optical tube 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-Telescoop-AC-80-400-OTA-2.jpg\" alt=\"Rack and pinion focuser of the Omegon AC 80\/400 OTA\" 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\">Wide field of view, simple operation<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The rack-and-pinion focuser with a 1.25-inch connection accepts any standard eyepiece. With a 20 mm eyepiece, you get 20x magnification and a view of entire constellations; star fields, the full lunar disk, and daytime landscapes are the domain of this tube.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keep the magnification low: at f\/5, an achromat will show color fringing above about 80x. This is deliberately a wide-field instrument.<\/p>\n<\/div>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading\">Mix and match<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">On an altazimuth mount, a photo tripod with a sturdy head, or as a secondary tube alongside a larger telescope: this OTA is the most affordable starting point for a custom setup.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Included<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Achromatic refractor 80\/400 with multicoating (optical tube only)<\/li>\n\n\n<li>Rack and pinion focuser with 1.25-inch connection<\/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 Mini II Dobson mount (59 euros) instantly turns it into a complete tabletop telescope, and the Omegon Titania 500 tripod (129 euros) is the standing solution. The Omegon 7-21 mm zoom eyepiece (69 euros) provides continuously variable magnification from 19x to 57x, and an Omegon Premium moon filter (19.90 euros) subdues the bright Moon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Never look at the sun through a telescope without a certified solar filter: this will cause permanent eye damage within a second.<\/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: DIY builders and travelers looking for a lightweight wide-field optical tube for an existing mount or tripod. Not for: anyone who wants a complete out-of-the-box set; the AC 80\/400 AZ-3 is the same optical tube with mount, tripod, and accessories. Compare entry-level models via the <a href=\"\/en\/telescope-selection-aid\/\">Choice assistant<\/a>. Meer Omegon stands 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>80 mm<\/td><\/tr><tr><td>Focal length<\/td><td>400 mm<\/td><\/tr><tr><td>Opening ratio<\/td><td>f\/5<\/td><\/tr><tr><td>Optical design<\/td><td>Achromatic refractor<\/td><\/tr><tr><td>Execution<\/td><td>OTA (loose tube, without housing)<\/td><\/tr><tr><td>Focuser<\/td><td>Rack, 1.25 inch<\/td><\/tr><tr><td>Light output<\/td><td>About 130 times more than the naked eye<\/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 AC 80\/400 OTA is a standalone wide-field optical tube with a rack-and-pinion focuser and a 1.25-inch connection: lightweight, compact, and usable on any mount or sturdy photo tripod.<\/p>","protected":false},"featured_media":98428,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[126],"product_cat":[51,3175,567],"product_tag":[3352,3353],"class_list":["post-91868","product","type-product","status-publish","has-post-thumbnail","product_brand-omegon","product_cat-telescopen","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":[31058,90489,90495,31090,25659,26969,91761,94869,92457,24780],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":92382,"url":"https:\/\/www.telescoop.nl\/en\/omegon-ac-90-500-ota\/","url_meta":{"origin":91868,"position":0},"title":"Omegon AC 90\/500 OTA","author":"Info telescoop","date":"04-01-2026","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 AC 90\/500 OTA comes with a 2 inch Crayford-type focus lens, a 1.25\/2 inch adapter, tube rings and a transport bag: a wide-angle lens and a telephoto lens for advanced users.","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-Telescoop-AC-90-500-OTA-4.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":104660,"url":"https:\/\/www.telescoop.nl\/en\/acuter-solarus-80-zonnetelescoop-ota\/","url_meta":{"origin":91868,"position":1},"title":"Acuter Solarus-80 Solar Telescope OTA","author":"Info telescoop","date":"17-03-2026","format":false,"excerpt":"This is just the tube (OTA), without the mounting and tripod. You can choose the appropriate mounting and the accessories that come with it below. White light solar telescope with an 80 mm aperture, a 400 mm focal brandpoint and a fixed mounted glass solar filter (ISO 12312-2:2015). Complete with zoom eyepiece 25x\/40x\/80x, filter wheel with six color filters, solar viewfinder and smartphone adapter.\u2026","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\/03\/Acuter-Solarus-80-zonnetelescoop-OTA-%E2%80%93-80mm-specialist-voor-veilig-zonne-onderzoek.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/Acuter-Solarus-80-zonnetelescoop-OTA-%E2%80%93-80mm-specialist-voor-veilig-zonne-onderzoek.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/Acuter-Solarus-80-zonnetelescoop-OTA-%E2%80%93-80mm-specialist-voor-veilig-zonne-onderzoek.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/Acuter-Solarus-80-zonnetelescoop-OTA-%E2%80%93-80mm-specialist-voor-veilig-zonne-onderzoek.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":32340,"url":"https:\/\/www.telescoop.nl\/en\/bresser-ac-90-500-telescoop-messier-ota\/","url_meta":{"origin":91868,"position":2},"title":"\u00a0Bresser AC 90\/500 Telescope Messier OTA","author":"","date":"02-11-2025","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. The Bresser AC 90\/500 Messier OTA comes with achromatic optics, rack-focusing, SP 26 mm eyepiece, 6\u00d730 viewfinder, 90-degree star diagonal, accessory shoe, and slow-motion cable. Compact wide-field tube.","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\/Bresser-AC-90-500-Telescoop-Messier-OTA.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":32291,"url":"https:\/\/www.telescoop.nl\/en\/bresser-messier-102-460-refractor-hexafoc-ota\/","url_meta":{"origin":91868,"position":3},"title":"Bresser Messier 102\/460 Refractor Hexafoc OTA","author":"","date":"02-11-2025","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. 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You can choose the appropriate mounting and the accessories that come with it below. The Omegon 66\/400 Pro APO ED comes with a 2-inch Crayford-type rotating focus lens, two tube clamps, a dovetail bracket and a carrying case: FPL-53 quality in a 1.6 kg travel tube.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Omegon 66\/400 Pro APO ED OTA","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Apochromatische-refractor-Pro-APO-AP-66-400-ED-OTA.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Apochromatische-refractor-Pro-APO-AP-66-400-ED-OTA.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Apochromatische-refractor-Pro-APO-AP-66-400-ED-OTA.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Apochromatische-refractor-Pro-APO-AP-66-400-ED-OTA.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Apochromatische-refractor-Pro-APO-AP-66-400-ED-OTA.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Apochromatische-refractor-Pro-APO-AP-66-400-ED-OTA.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/91868","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=91868"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/98428"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=91868"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=91868"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=91868"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=91868"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}