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pentamirror

From Wiktionary, the free dictionary

English

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Etymology

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From penta- +‎ mirror.

Noun

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English Wikipedia has an article on:
Wikipedia

pentamirror (plural pentamirrors)

  1. (photography) A system of three (not five) mirrors used as a cheaper substitute to a pentaprism in the viewfinders of some single-lens reflex cameras
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