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pentaprism
or pen·ta prism
[ pen-tuh-priz-uhm ]
noun
- a prism that has five faces, a pair of which are at 90° to each other; a ray entering one of the pair emerges from the other at an angle of 90° to its original direction: used especially in single-lens reflex cameras to reverse images laterally and reflect them to the viewfinder.
pentaprism
/ ˈpɛntəˌprɪzəm /
noun
- a five-sided prism that deviates light from any direction through an angle of 90°, typically used in single-lens reflex cameras between lens and viewfinder to present the image the right way round
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Word History and Origins
Origin of pentaprism1
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