Definitions for "Pentaprism"
Keywords:  slr, prism, reflex, mirror, focused
Five-sided prism in SLR cameras that renders a correctly-oriented view of the focusing screen.
Optical device, found on SLR cameras, which corrects the image (reversed by the lens), allowing eye-level viewing and focusing via the viewfinder. (see Finder, Focusing screen,& SLR )
A five-sided prism (obviously!) that provides an eye-level, right-way up, left to right correct view of the subject.