Porro prisms are similar to right angle prisms. Porro prisms are used for a 90° light path bend by using the hypotenuse face of the prism rather than the leg faces. This configuration produces a right-handed image since two reflections occur. The incident ray's direction is reversed when using a porro prism since the object enters and the image exits the same face.
Experimental Grade Porro Prisms are offered in several experimental grade options. Grade 1 is standard optical glass, edged, free of visible scratches, chips, stains or oxidation. Grade 2 is unedged, non-optical glass, small chips, slight stains or other defects. Grade 2may have slight edge cement separation.
Note: Specifications for experimental grade optics may vary as much as 10% from those listed. Also, no additional information is available other than what is provided.