pentaprism

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English - English
A five-sided prism used in the viewfinder of some single-lens reflex cameras
Five-sided silvered prism in SLR cameras, used to give an upright left-to-right view of the image on the focusing screen
In a reflex camera, a specially shaped prism which allows the camera to be used at eye level while providing a right-way-up and right-way-round view of the subject
A multi sided glass prism housed in the roof of an single-lens reflex camera so that the image that's seen be the lens can be viewed through an optical viewfinder above the lens The light enters through the lens is reflected up by a reflex mirror to the prism and across to the eye