1A reflecting prism in which the light is reflected on two 45° surfaces and returned parallel to the incoming beam. Compare with roof prism.
- While not as sexy as a roof prism, the porro prism is a dependable unit made for the outdoors.
- Two porro prism binocular models are new, the 8x42 mm and the 10x42 mm.
- Modern roof prism designs are capable of performance just as good as a comparable porro prism design, due to current technology such as phase coating and improved reflective backing materials on the prisms.
Named after the Italian scientist Ignazio Porro (1801–75).
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