{"id":34223,"date":"2025-11-17T15:31:35","date_gmt":"2025-11-17T14:31:35","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34223"},"modified":"2026-08-23T15:07:13","modified_gmt":"2026-08-23T13:07:13","slug":"william-optics-0-72x-reducer-flattener-full-frame","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-0-72x-reducer-flattener-full-frame\/","title":{"rendered":"William Optics 0.72x Reducer\/Flattener Full-Frame"},"content":{"rendered":"

William Optics 0.72x Reducer\/Flattener Full-Frame: full-frame speed for large apos<\/strong><\/h2>\n\n\n\n

The William Optics 0.72x is the reducer-flattener for the large apochromats from the WO lineup: the GT102 (with 3-inch focuser), FLT132, and GT153. It flattens the field of view up to full-frame and shortens the focal length to 0.72x: almost a full stop of speed gain and a wider field of view.<\/p>\n\n\n\n

Every refractor naturally produces a slightly curved image plane; a flat camera sensor cuts right through it, causing stars in the corners to stretch into streaks. A flattener corrects that curvature so that stars remain small and round all the way to the corners.<\/p>\n\n\n\n

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Ohara glass optics<\/h4>\n\n\n\n

The triplet made of Japanese Ohara glass with FMC coating keeps stars sharp to the corners of a full-frame sensor, with maximum contrast and minimal reflections.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Adjustable back focus<\/h4>\n\n\n\n

You adjust the distance to the telescope by rotating the flattener, allowing you to tune it for different cameras, from DSLRs to cooled CMOS. The M48 camera side with integrated filter thread incorporates your filter directly into the train.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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

Connect your camera with the William Optics M48 adapter or 48 mm T-ring for your mount.<\/p>\n\n\n\n

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