roof prism

A roof prism is an optical device used in binoculars and other telescopes to invert and revert the image while keeping the design compact. It consists of two prisms arranged in a roof-like configuration, allowing for a straight-line optical path. This design keeps the binoculars slim and lightweight, making them easier to handle. Roof prisms are essential for providing a correct orientation of the image, so objects appear the right way up and not reversed, which enhances the user's viewing experience in various activities such as birdwatching, hiking, or stargazing.