{"id":34228,"date":"2025-11-17T15:31:55","date_gmt":"2025-11-17T14:31:55","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34228"},"modified":"2026-08-25T15:11:45","modified_gmt":"2026-08-25T13:11:45","slug":"william-optics-flat6a-iii-reducer-flattener-adjustable-2-inch","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-flat6a-iii-reducer-flattener-adjustable-2-inch\/","title":{"rendered":"William Optics Flat6A III Reducer Flattener Adjustable 50.8 mm"},"content":{"rendered":"

William Optics Flat6A III Adjustable 50.8 mm Reducer Flattener: WO's most versatile flattener-reducer<\/strong><\/h2>\n\n\n\n

The William Optics Flat6AIII combines a field flattener with a 0.8x reducer. Every refractor naturally produces a slightly curved image plane; a flat camera sensor cuts through it, causing stars in the corners to stretch into streaks. A flattener corrects that curvature, keeping stars small and round all the way to the corners. The reducer also shortens the focal length: a wider field of view and shorter exposures.<\/p>\n\n\n\n

The correction is calculated up to full-frame and works across virtually the entire field on APS-C. Made for the William Optics GT71, GT81, Z81, and Z103, and more broadly applicable to f\/6 to f\/7.5 refractors.<\/p>\n\n\n\n

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Adjustable with scale<\/h4>\n\n\n\n

Using the distance scale adjustment, you tune the flattener to your telescope and camera; you can easily set the value you found again for the next session. The black-coated interior suppresses reflections.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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On the train<\/h4>\n\n\n\n

Telescope side M63, camera side M48 with 48 mm filter thread. With the William Optics M48 adapter for your bayonet, the sensor is directly at the correct distance; the separate M63 adapter with 2-inch barrel allows mounting in a 2-inch focuser.<\/p>\n<\/div>\n<\/div>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

Combine the Flat6AIII with the M48 adapter for your cameramerk and, if you have a 2-inch focuser, with the M63\/2-inch adapter.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n