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Roof prism

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A pentaprism used in Single-lens reflex cameras; the lower right face is the roof.

A roof prism is in general any kind of reflective optical prism containing a section where two faces meet at a 90° angle. Reflection from the two faces returns an image that is flipped laterally across the axis where the faces meet.

A single Porro prism is the simplest type of roof prism, though in its most common application (the double-Porro configuration in binoculars) it is not used as a roof prism.

Other common roof prisms are the Amici roof prism, the Abbe-Koenig prism, the Schmidt-Pechan prism, and the roof pentaprism.

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