Porro–Abbe prism

The Porro–Abbe prism is an optical component commonly found in binoculars and other optical devices. It is a type of roof prism system that combines the functions of image inversion and image rotation. The prism system is designed to bend the incoming light path in a way that allows for a more compact design, enabling a shorter overall length of the optical instrument. The Porro–Abbe prism typically consists of two prisms arranged in a specific orientation.