![]() The viewed image is neither inverted nor reversed. The direct-optical viewfinder most commonly used, the bright-line viewfinder, is essentially an inverted Galilean telescope system with an optically projected rectangle outlining the frame area. The focusing mechanism of the viewfinder regulates the main lens as well. The image is not inverted but is laterally reversed. ![]() In a twin-lens reflex camera, the finder has a lens of its own, essentially a duplicate of the aperture lens, placed above it and reflecting the image by a mirror to a ground-glass screen. The sighting devices in cameras lacking screens are called viewfinders they show how much of the scene will appear on.
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