Exposure Infographic
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Shutter speed
shutter speed is the amount of time that the shutter is open.
The camera's shutter speed, the lens's aperture (also called f-stop), and the scene's luminance together determine the amount of light that reaches the film or sensor (the exposure).
As a result you’ll usually have the options for the following shutter speeds 1/500, 1/250, 1/125, 1/60, 1/30, 1/15, 1/8 etc.
Canon EOS - Getting Started: ISO, Shutter Speed and Aperture Tutorial