{"id":34224,"date":"2025-11-17T15:31:39","date_gmt":"2025-11-17T14:31:39","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34224"},"modified":"2026-03-20T09:49:31","modified_gmt":"2026-03-20T08:49:31","slug":"william-optics-flat-gt-flattener-gran-turismo-refractor-2-inch","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-flat-gt-flattener-gran-turismo-refractor-2-inch\/","title":{"rendered":"William Optics Flat GT Flattener for GranTurismo Refractor"},"content":{"rendered":"

William Optics Flat GT - Flattener for GranTurismo Refractors<\/strong><\/p>\n\n\n\n

The William Optics Flat GT<\/strong> keeps your stars sharp to the edge of the image. It corrects the curvature of the field of view so that stars are not stretched or distorted. This is especially important with fast refractors (f\/5-f\/7) and large cameras.<\/p>\n\n\n\n

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

You easily mount the flattener between your telescope and camera. For best results, place the camera about 55 mm from the back of the flattener. This keeps your image sharp, clear and well exposed across the entire field.<\/p>\n\n\n\n

The Flat GT is suitable for the WO GranTurismo 71 & 81<\/strong>. It has an M63 telescope connector and M48 camera connector. Its compact 22 mm length keeps your setup light and stable. With two lenses in one group, you get an evenly corrected field of view of 44 mm, ideal for astrophotography.<\/p>\n\n\n\n

\"William<\/figure>\n\n\n\n

With the Flat GT you will see your stars as real points, your shots will be accurate and professional without additional adapters or extensions.<\/p>\n\n\n\n

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

Capacity<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Suitable for telescopes<\/td>WW Gran Turismo 71 & 81<\/td><\/tr>
Connection on camera side<\/td>M48 x 0.75<\/td><\/tr>
Telescope connection<\/td>M63x1 male<\/td><\/tr>
Backfocus (mm)<\/td>56.6 mm (GT71) \/ 55 mm (GT81)<\/td><\/tr>
Corrected field of view (mm)<\/td>44<\/td><\/tr>
Number of lenses<\/td>2<\/td><\/tr>
Number of groups<\/td>1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

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

Feature<\/th>Description<\/th><\/tr><\/thead>
Type<\/td>Flatteners, Correctors, Reducers<\/td><\/tr>
Design<\/td>Flattener<\/td><\/tr>
Weight (g)<\/td>180<\/td><\/tr>
Length (mm)<\/td>22<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

William Optics Flat GT comes with M63 telescope mount, M48 camera thread, integrated filter thread, 2-element optics, full-frame correction and distance ring for GT71 and GT81 - for sharp stars all the way to the image edge.<\/p>","protected":false},"featured_media":97628,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[56,469,3107,3105,589,3104,592],"product_tag":[],"class_list":["post-34224","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescoop-accessoires","product_cat-astro-fotografie","product_cat-flatteners","product_cat-optische-accessoires","product_cat-optische-accessoires-v1","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":105023,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-blitz-50-base\/","url_meta":{"origin":34224,"position":0},"title":"Levenhuk Blitz 50 BASE \u2013 50\/600 Refractor","author":"Abdullah Ibrar","date":"01-04-2026","format":false,"excerpt":"The Levenhuk Blitz 50 BASE \u2013 50\/600 Refractor comes with 6mm and 20mm eyepieces, a 3x Barlow lens, a 5x24 finder scope, a diagonal mirror, and an aluminum tripod. This user-friendly beginner telescope is ideal for observing the Moon, bright objects, and simple daytime nature observation.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk Blitz 50 BASE achromatic refractor on a fully extended aluminum tripod, showing the complete setup from the front.","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":104875,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-labzz-t3\/","url_meta":{"origin":34224,"position":1},"title":"Levenhuk LabZZ T3 - 60\/700 Refractor","author":"Abdullah Ibrar","date":"24-03-2026","format":false,"excerpt":"Levenhuk LabZZ T3 - 60\/700 Refractor comes with 4mm eyepiece, 12.5mm eyepiece, 1.5x eyepiece, 3x Barlow lens, 5x optical viewfinder, zenith mirror and aluminum tripod with accessory tray.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk LabZZ T3 - 60\/700 Refractor aluminium statief met accessoirebak","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/Levenhuk-LabZZ-T3-60700-Refractor-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":105543,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-skyline-travel-70\/","url_meta":{"origin":34224,"position":2},"title":"Levenhuk Skyline Travel 70 - 70\/400 Refractor","author":"Abdullah Ibrar","date":"03-04-2026","format":false,"excerpt":"The Levenhuk Skyline Travel 70 \u2013 70\/400 Refractor comes with 10mm and 20mm eyepieces, a 3x Barlow lens, a 5x24 finderscope, a diagonal prism, an aluminum tripod, and a backpack. This compact travel telescope is ideal for observing the Moon, bright planets, and nature.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk Skyline Travel 70 compact refractor with included backpack for easy transportation","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/levenhuk-telescope-skyline-travel-70_ZHSMksd_500_784c0dc006013c7ff5ad43e1c4c51569.webp?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":105495,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-new-skyline-pro-16\/","url_meta":{"origin":34224,"position":3},"title":"Levenhuk New Skyline PRO 16\u2033 \u2013 406\/1830 Dobson","author":"Abdullah Ibrar","date":"03-04-2026","format":false,"excerpt":"The Levenhuk New Skyline PRO 16\" \u2013 406\/1830 Dobson comes with 10 mm and 25 mm Pl\u00f6ssl eyepieces, an 8x40 optical finderscope, and a primary mirror cooling system. This very powerful telescope is ideal for observing the Moon, planets, and extremely detailed deep-sky objects.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk New Skyline PRO 16 inch main setup with optical tube on Dobsonian mount","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/86287_levenhuk-new-skyline-pro-16-telescope_00_500_465f630cb432cbffc2c1740e1897afbc.webp?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":107604,"url":"https:\/\/www.telescoop.nl\/en\/televue-tele-pod-advanced-azimutale-montering\/","url_meta":{"origin":34224,"position":4},"title":"TeleVue Tele-Pod Advanced \u2013 Azimuth Mount","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"TeleVue Tele-Pod Advanced \u2013 azimutale montering wordt geleverd met aluminium statief, transporttas en biedt soepele bediening voor lichte telescopen. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Montering Tele-Pod Advanced close-up van de azimutale montagekop op zwart geanodiseerd aluminium statief met blauwe accentring op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":106246,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-discovery-spark-767-az\/","url_meta":{"origin":34224,"position":5},"title":"Levenhuk Discovery Spark 767 AZ \u2013 76\/700 Newtonian Reflector","author":"Abdullah Ibrar","date":"05-04-2026","format":false,"excerpt":"The Levenhuk Discovery Spark 767 AZ \u2013 76\/700 Newtonian reflector comes with SR4mm, H12.5mm, and H20mm eyepieces, a 2x Barlow lens, an optical finder, an aluminum tripod with an accessory tray, and the colorful knowledge book \u201cSpace. Not an Empty Void.\u201d Ideal for beginners who want to discover the Moon, planets, and deep-sky objects.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk Discovery Spark 767 AZ complete set met Newton-reflector op alt-azimut montering en aluminium statief op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/79071_discovery-spark-767-az-telescope_00_500_8a8d4daec6536c85fe839f5bcbed1b02.webp?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/34224","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=34224"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/97628"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=34224"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=34224"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=34224"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=34224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}