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The device is called a "shutter." Shutters take many forms, but consist generally of some mechanism for opening and closing a light pathway over a specific interval. In the earliest cameras, it consisted of nothing more than a lens cap, removed and replaced manually. As photographic media became more sensitive and required shorter exposure times, this method proved too cumbersome, and a variety of mechanical devices were invented to control the duration of exposure, in some cases down to thousandths of a second.

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