Exposure Infographic

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Aperture

aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.

f/number – for example f/2.8, f/4, f/5.6,f/8,f/22 etc.

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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.

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Canon EOS - Getting Started: ISO, Shutter Speed and Aperture Tutorial