Porro prisms are isosceles right-angled triangular prisms molded from glass blocks, with the end plane facing the right angle. In use, the light enters the large rectangular surface of the prism, passes through the two total reflections of the inclined surface, and then penetrates the original incident plane to exit. Because light only enters and exits in a normal state, the prism has no effect of dispersion. Pro prisms are used especially in many binoculars to provide image reconstruction and longer optical path folding, which effectively shortens the distance between the objective lens and the eyepiece. The conventional product specifications are shown in the table below, and we can also customize various specifications of Pro prisms for customers.