{"id":34297,"date":"2025-11-17T18:26:31","date_gmt":"2025-11-17T17:26:31","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=34297"},"modified":"2026-03-03T20:20:56","modified_gmt":"2026-03-03T19:20:56","slug":"william-optics-flt91-flat6a-iii-special-edition","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/william-optics-flt91-flat6a-iii-special-edition\/","title":{"rendered":"William Optics FLT91 Flat6A III Special Edition"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The <strong>William Optics FLT91 Flat6A III<\/strong> flattener takes your astrophotography to the next level. This lens corrects the curvature in the field of view of your FLT91 telescope. Without a flattener, stars are stretched and out of focus toward the edge. With this flattener, stars remain sharp and round all the way to the edge.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" src=\"https:\/\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-FLT91-Flat6A-III-Special-Edition.jpg\" alt=\"William Optics FLT91 Flat6A III flattener mounted on FluoroStar FLT91 with camera lens adapter visible\" class=\"wp-image-34309\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This specially calculated flattener is matched to the FluoroStar FLT 91. You easily mount it between your telescope and camera. The included adapter ensures that everything fits perfectly. The optimal distance from camera to flattener is 5.4 mm, so your sensor is exactly in focus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use the flattener especially with large cameras and small focal ratios (f\/5-f\/7). This way you get maximum sharpness out of your images. The result: star-sharp photos of deep sky objects, without distortion or stretched edges.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In short, the Flat6A III makes your FLT91 ideal for serious astrophotography with DSLR or CCD.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Specifications<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Capacity<\/strong><\/p>\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>Telescope connection<\/td><td>2\u2033<\/td><\/tr><tr><td>Flange focal distance (mm)<\/td><td>5,4<\/td><\/tr><tr><td>Suitable for telescopes<\/td><td>FluoroStar FLT 91\/540<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>General<\/strong><\/p>\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>Flatteners, Correctors, Reducers<\/td><\/tr><tr><td>Design<\/td><td>Flattener<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>William Optics FLT91 Flat6A III comes with custom flattener, 2\u2033 telescope connector, camera adapter and fixed flange distance - designed for full field of view adjustment on the FLT 91 refractor.<\/p>","protected":false},"featured_media":97649,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[56,469,589,3105,3104,592],"product_tag":[],"class_list":["post-34297","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescoop-accessoires","product_cat-astro-fotografie","product_cat-optische-accessoires-v1","product_cat-optische-accessoires","product_cat-overige-astrofotografie-accessoires","product_cat-reducers-flatteners","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":[],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":33971,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-6a-adapters-voor-flattener\/","url_meta":{"origin":34297,"position":0},"title":"William Optics 6A Adapters for Flattener\u00a0","author":"","date":"15-11-2025","format":false,"excerpt":"William Optics 6A comes as an adapter with an M92 telescope connector to an M63 connecting thread, suitable for the William Optics Flattener Flat6A or Flat6A III. \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-6A-Adapters-voor-Flattener-.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-6A-Adapters-voor-Flattener-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-6A-Adapters-voor-Flattener-.jpg?resize=525%2C300&ssl=1 1.5x, 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ZenithStar","author":"Info telescoop","date":"16-11-2025","format":false,"excerpt":"William Optics Flat61R 61 comes with an adjustable M54 telescope connector, M48 camera connector and an integrated M48 filter thread for perfectly corrected astrophotography with ZenithStar telescopes. \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-Flat61R-61-Beeldveldegalisator-voor-ZenithStar-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-Flat61R-61-Beeldveldegalisator-voor-ZenithStar-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-Flat61R-61-Beeldveldegalisator-voor-ZenithStar-1.jpg?resize=525%2C300&ssl=1 1.5x, 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telescoop","date":"15-11-2025","format":false,"excerpt":"William Optics Flat68II Flat7A comes as a 45mm long adapter that forms a connection between the Flat68II or Flat7A flatteners and your camera's T2 ring. \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-Flat68II-Flat7A-Adapter-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-Flat68II-Flat7A-Adapter-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-Flat68II-Flat7A-Adapter-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-Flat68II-Flat7A-Adapter-1.jpg?resize=700%2C400&ssl=1 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