https://www.shalomeo.com/Optics/Prisms/Porro-Prisms/product-482.html
Porro Prisms - Periscopes, telescopes, binoculars and monoculars | Roof prism
Hangzhou Shalom EO offers Porro prisms made of BAK4, BK7 and UV fused silica, they are widely applied in periscopes, telescopes, binoculars and monoculars.
binoculars and monocularsporroprismsperiscopestelescopes