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• eliminates the field curvature in bright, short refractors, with an active diameter of 38 mm
• the field flatness corrector designed for short focal length refractors with focal lengths from 400 to 660 mm and apertures from f / 5 to f / 7.5
• does not change the focal length of the optical system
• compatible with 2 "(50.8 mm) hoists
• output from the camera / camera side: T2 (M42x0.75) and M48 * 0.75 (reduction included)
• backfocus required: 55 mm
• optics fully covered with MC layers 
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