Prisms and prism types in binoculars Lenses have the property of displaying objects upside down and laterally inverted - therefore the image must be rotated again. The image created in this way is first straightened up again by the prisms and displayed upside down. Either so-called porro prisms or roof prisms are used for this purpose. Porro prisms give the entire binoculars their characteristic angled shape, while roof prisms give the binoculars a slim design. Binocular prisms [...]
