A pentamirror is an optical device used in the viewfinder systems of various single-lens reflex cameras instead of the pentaprism. It is used to reverse again the laterally reversed image coming from the reflex mirror.
Instead of the solid block of glass of the prism in pentaprism system, here 3 mirrors are used to perform the same task. This is cheaper and lighter, but generally produces a viewfinder image of lower quality and brightness.
This optical device is often (more precisely) referred to as roof pentamirror because of the roof-like ridge.
- Mike Stensvold. The Complete Idiot's Guide to Photography Like a Pro, 2002, page 26.
- David D. Busch. Digital Photography All-in-One Desk Reference for Dummies, 2006, page 106.
- Paul R. Yoder. Opto-Mechanical Systems Design, 2005, page 435.
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