Schmidt prism

Schmidt prism

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He Rui optics'Schmidt prism, also known as a Schmidt-Pechan prism, is an optical prism used primarily to rotate an image by 180°. This type of prism is commonly used in binoculars as part of the image erection system. It consists of two glass prisms separated by an air gap and achieves the image rotation through multiple total internal reflections. The image is first vertically flipped by the reflections and then laterally inverted by the “roof” section of the second prism, resulting in a 180° rotation of the image. One of the key characteristics of the Schmidt prism is that it does not alter the handedness of the image.

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