If the aperture is like the pupil in a human eye, then the camera’s shutter is like an eyelid – light can only enter while it is open. The ‘shutter speed’ refers to the length of time that this shutter is open for, allowing light to fall on to the camera’s sensor in order to create an exposure.
Shutter speed is measured in fractions of a second, with a ‘fast’ shutter speed including settings such as 1/250th of a second or 1/1000th of a second while a ‘slow’ shutter speed setting would be 1/15th of a second,
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