{"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":"2026-09-10T14:45:39","modified_gmt":"2026-09-10T12:45:39","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\/\">merk 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>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":[],"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_shipping_class-licht","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":[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":"The Omegon AC 90\/500 OTA comes with a 2-inch Crayford focuser, 1.25\/2-inch adapter, tube rings, and transport bag: wide-field telescope and guide scope 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":32340,"url":"https:\/\/www.telescoop.nl\/en\/bresser-ac-90-500-telescoop-messier-ota\/","url_meta":{"origin":91868,"position":1},"title":"\u00a0Bresser AC 90\/500 Telescope Messier OTA","author":"","date":"02-11-2025","format":false,"excerpt":"The Bresser AC 90\/500 Messier OTA comes with achromatic optics, rack-and-pinion focuser, SP 26 mm eyepiece, 6x30 finder scope, 90-degree star diagonal, accessory shoe, and slow-motion cable. 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