Definition of "pentaprism" []

• A five-sided prism used in the viewfinder of some single-lens reflex cameras (noun)

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• "The mirror and pentaprism and related mechanisms are expensive to manufacture and maintain."
• "So I got some black duct tape, covered up the Nikon wording on the pentaprism and got a no name camera strap and lens cap - and suddenly there was no more agro."
• "They get the smaller body by eliminating the pentaprism-and-mirror mechanism common to single-lens-reflex cameras, effectively making this into a point-and-shoot style camera, where the light goes directly from the lens onto the sensor."