shutter time

Definition: Setting of a camera control that determines the time during which the film or light-detector is exposed to light. * Almost always incorrectly referred to as 'shutter speed'. Time to speed isn't speeding time Shutter speed -- the velocity at which the blades or curtains of the shutter actually move -- of modern shutters is substantially constant, apart from the extremely rapid acceleration and deceleration at the start and end of a shutter run. The leading edge of the blades or curtains of a shutter run at exactly the same speed irrespective of the shutter setting. Any musician knows that their fingers must move at the same speed to play a note whether they play fast or slow: the speed of movement stays the same, the timing of the note is different.

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