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A battery powered mechanism that winds on the film after each picture is taken. Older cameras had connection terminals on the base of the camera where a motor drive (generally two frames per second (fps)or faster) or powerwinder (below two frames per second) could be attached. Most modern cameras have integral motor drives.
An extra feature found on only a few cameras that is used to lock the viewing mirror in the up position while the shutter is fired. The benefit is almost no vibration as well as the ability to keep up with an ultra-fast motor drive. This feature tends to be more common on medium format cameras because the mirror is larger and creates more vibration as it bounces out of the way of the film plane.