{"id":92575,"date":"2026-01-06T12:35:16","date_gmt":"2026-01-06T11:35:16","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=92575"},"modified":"2026-03-03T20:25:23","modified_gmt":"2026-03-03T19:25:23","slug":"omegon-pro-apo-ap-71-490-quadruplet-ota","status":"publish","type":"product","link":"https:\/\/staging.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":"

Omegon Pro AP 71\/490 Refractor - compact apochromatic for serious astrophotography<\/strong>
The Omegon Pro AP 71\/490 is built for astrophotographers who want to see more and capture more. This compact apochromatic refractor lets you rediscover the sky, with bright colors and fine details hidden by simple optics. You will notice it immediately: stars remain sharp to the edge and nebulae show their true shapes and structures. This gives you images you can be proud of, even from less dark locations.<\/p>\n\n\n\n

Color clean and flat image right out of the box<\/strong>
Thanks to the quadruplet lens design with high-quality ED glass, you will see virtually no color errors. Stars remain point-shaped and nebulae show their natural color gradient. The integrated corrector ensures a flat and well-lit field of view, even when using full-frame cameras. That means less post-processing and more time to enjoy your results.<\/p>\n\n\n\n

\"Omegon<\/figure>\n\n\n\n

Why this refractor shows more detail<\/strong>
This apochromatic is designed to maximize contrast. Each lens surface has a high-quality multicoating so that as much light as possible reaches your camera or eye. This produces bright images with clear separation between object and background. On planets, you will see finer structures, and on deep-sky objects, subtle details come out better. This is precisely why many astrophotographers choose this type of optic.<\/p>\n\n\n\n

Powerful 2.5\u2033 focuser for heavy-duty cameras<\/strong>
The rugged 2.5\u2033 rack-and-pinion focuser is made for precision work. You focus without jerking, even with heavier cameras and accessories up to about 4 kg. The 1:10 fine adjustment helps you find exactly that focus where stars stay small and sharp. This makes a big difference in long exposures as your image remains stable and sharp.<\/p>\n\n\n\n

\"Omegon<\/figure>\n\n\n\n

360\u00b0 rotation for perfect alignment<\/strong>
Is your object in focus but just misaligned on the sensor? With the 360\u00b0 rotating focuser, you easily rotate the camera to the correct position without having to refocus. This saves time and avoids frustration during nighttime photo sessions.<\/p>\n\n\n\n

Flexible and ready for expansion<\/strong>
The telescope comes as an OTA and is easy to combine with your existing mount. The removable 2\u2033 eyepiece adapter reveals an M64x0.75 thread, so you can use additional accessories without any problem. Everything is designed for flexibility and future-proofing.<\/p>\n\n\n\n

What we recommend<\/strong>
\u2713 Astrophotography: excellent, even with full-frame cameras
\u2713 Nebulae and galaxies: rich in detail and contrast
\u2713 Moon and planets: sharp and color-pure
\u2713 Advanced users seeking compact top quality
\u2717 Beginners who want an easy entry level<\/p>\n\n\n\n

Specifications<\/h3>\n\n\n\n

Optics<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Type<\/td>Refractor<\/td><\/tr>
Design<\/td>Apochromate<\/td><\/tr>
Lens Design<\/td>Quadruplet<\/td><\/tr>
Opening<\/td>71 mm<\/td><\/tr>
Focal length<\/td>490 mm<\/td><\/tr>
Opening ratio<\/td>f\/6,9<\/td><\/tr>
Resolution<\/td>1,94\u2033<\/td><\/tr>
Boundary magnitude<\/td>12,3<\/td><\/tr>
Max. useful magnification<\/td>142\u00d7<\/td><\/tr>
Corrected field of view<\/td>44 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Focuser<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Design<\/td>Rack-and-pinion<\/td><\/tr>
Ocula Connection<\/td>2\u2033<\/td><\/tr>
Fine adjustment<\/td>1:10 reduction<\/td><\/tr>
Adjustment range<\/td>50 mm<\/td><\/tr>
Rotatable<\/td>Yes, 360\u00b0<\/td><\/tr>
Ring clamp<\/td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Mount<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Type<\/td>OTA (without mount)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Included accessories<\/strong><\/p>\n\n\n\n

Section<\/th>Description<\/th><\/tr><\/thead>
Corrector<\/td>Integrated<\/td><\/tr>
Dew cap<\/td>Yes<\/td><\/tr>
Dovetail<\/td>Vixen-style<\/td><\/tr>
Oculai adapter<\/td>1,25\u2033 & 2\u2033<\/td><\/tr>
Tube Rings<\/td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

General<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Series<\/td>Pro APO<\/td><\/tr>
Variant<\/td>Flat-Field<\/td><\/tr>
Length<\/td>373 mm<\/td><\/tr>
Tube weight<\/td>3.0 kg<\/td><\/tr>
Total weight<\/td>4.7 kg<\/td><\/tr>
Application<\/td>Astrophotography, Moon & Planets, Nebulae & Galaxies<\/td><\/tr>
Recommended for<\/td>Advanced<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

Omegon Pro AP 71\/490 Refractor<\/span>\u00a0Comes with integrated field flattener, 2.5\u2033 focuser with 1:10 reduction, ring clamps, Vixen-style dovetail, Amici prism (1.25\u201d), 8mm & 20mm eyepieces - ideal for advanced astrophotographers desiring high image quality with flat field of view.<\/span><\/p>","protected":false},"featured_media":98930,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[126],"product_cat":[51,567],"product_tag":[],"class_list":["post-92575","product","type-product","status-publish","has-post-thumbnail","product_brand-omegon","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":92586,"url":"https:\/\/staging.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":"Omegon Pro AP 40\/180 Refractor comes with integrated corrector, quadruplet ED optics, helical focuser, M48 connector, rotary mechanism, dew shield, Vixen-style dovetail and tube rings - ideal for mobile astrophotographers who demand ultra-sharp and color-pure imaging. \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\/2026\/01\/Omegon-apochromatische-refractor-Pro-APO-DoubleED-AP-40-180-Quadruplet-OTA-8.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-apochromatische-refractor-Pro-APO-DoubleED-AP-40-180-Quadruplet-OTA-8.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-apochromatische-refractor-Pro-APO-DoubleED-AP-40-180-Quadruplet-OTA-8.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-apochromatische-refractor-Pro-APO-DoubleED-AP-40-180-Quadruplet-OTA-8.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":33684,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-ota\/","url_meta":{"origin":92575,"position":1},"title":"William Optics AP 71\/350 71 Apochromatic refractor RedCat OTA","author":"","date":"14-11-2025","format":false,"excerpt":"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","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-71-350-71-Apochromatische-refractor-RedCat-OTA-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-71-350-71-Apochromatische-refractor-RedCat-OTA-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-71-350-71-Apochromatische-refractor-RedCat-OTA-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-71-350-71-Apochromatische-refractor-RedCat-OTA-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":33699,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-ap-71-350-71-apochromatische-refractor-redcat-wifd\/","url_meta":{"origin":92575,"position":2},"title":"William Optics AP 71\/350 71 Apochromatic refractor RedCat WIFD","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics AP 71\/350 71 wordt geleverd met een beschermende nylon draagtas, een in de objectiefkap ingebouwd Bahtinov-masker voor perfecte scherpstelling, en een veelzijdige Arca-Swiss & Vixen-Style zwaluwstaart voor eenvoudige montage. \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-71-350-71-Apochromatische-refractor-RedCat-WIFD-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-71-350-71-Apochromatische-refractor-RedCat-WIFD-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-71-350-71-Apochromatische-refractor-RedCat-WIFD-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-71-350-71-Apochromatische-refractor-RedCat-WIFD-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":92032,"url":"https:\/\/staging.telescoop.nl\/en\/omegon-pro-96-575-apochromatische-refractor-triplet-ed-fcd-100\/","url_meta":{"origin":92575,"position":3},"title":"Omegon Pro 96\/575 Apochromatic Refractor Triplet ED FCD-100","author":"","date":"03-01-2026","format":false,"excerpt":"The Omegon Pro APO AP 96\/575 Refractor comes with a high-quality FCD100 triplet ED lens, CNC tube clamps, Vixen dovetail bar, 2-inch\/1.25-inch adapter, finderscope shoe, and extendable dew shield \u2013 ideal for astrophotographers who want to capture color-pure and high-contrast images.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-96-575-Triplet-ED-FCD-100-3.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-96-575-Triplet-ED-FCD-100-3.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-96-575-Triplet-ED-FCD-100-3.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-96-575-Triplet-ED-FCD-100-3.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":92019,"url":"https:\/\/staging.telescoop.nl\/en\/omegon-pro-85-510-apochromatische-refractor-triplet-ed-fcd-100\/","url_meta":{"origin":92575,"position":4},"title":"Omegon Pro 85\/510 Apochromatic Refractor Triplet ED FCD-100","author":"","date":"03-01-2026","format":false,"excerpt":"The Omegon Pro APO AP 85\/510 Refractor comes with an FCD100 ED triplet lens, a 2.5\" rack and pinion focuser with reduction, CNC tube rings, Vixen dovetail, finder shoe, and retractable dew shield \u2013 ideal for demanding astrophotographers desiring razor-sharp images without chromatic aberration. \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\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-85-510-Triplet-ED-FCD-100-3.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-85-510-Triplet-ED-FCD-100-3.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-85-510-Triplet-ED-FCD-100-3.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-refractor-Pro-APO-AP-85-510-Triplet-ED-FCD-100-3.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":92039,"url":"https:\/\/staging.telescoop.nl\/en\/omegon-pro-108-600-apochromatische-refractor-quintuplet-ota\/","url_meta":{"origin":92575,"position":5},"title":"Omegon Pro 108\/600 Apochromatic Refractor Quintuplet OTA","author":"","date":"03-01-2026","format":false,"excerpt":"Omegon Pro APO AP 108\/600 Refractor\u00a0wordt geleverd met ingebouwde corrector, 4 inch-focuser, draaihandvat, CNC-ringklemmen, adapters (M68, M54, M48, M52), Losmandy-stijl zwaluwstaart, oculairadapter en stevige transportkoffer \u2013 ideaal voor veeleisende astrofotografen die fullframe-compatibiliteit en haarscherpe beelden wensen.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-Refractor-Pro-APO-AP-108-600-Vijfling-OTA-8.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-Refractor-Pro-APO-AP-108-600-Vijfling-OTA-8.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-Refractor-Pro-APO-AP-108-600-Vijfling-OTA-8.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Apochromatische-Refractor-Pro-APO-AP-108-600-Vijfling-OTA-8.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/92575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=92575"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/98930"}],"wp:attachment":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=92575"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=92575"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=92575"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=92575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}