In photography, a device located either in front of or behind a camera lens which allows or impedes the passage of light into the camera. The shutter remains closed most of the time, and the camera operator, when the time comes to take a photograph, clicks the shutter button (or other means of control) which opens the shutter for a set period of time (called the expoosure time). The amount of time the shutter stays open (which can range from some fraction of a second in 35mm camerasd to several minutes in process cameras) is known as the shutter speed.

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