Foundations: Shutter Speed, Your Camera’s Eyelid

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 …