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aperture
Last modified: Wednesday, February 07, 2007 

A device that controls the amount of light admitted through an opening. In photography and digital photography, aperture is the unit of measurement that defines the size of the opening in the lens that can be adjusted to control the amount of light reaching the film or digital sensor. The size of the aperture is measured in F-stop.

See also shutter speed.

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device

digital camera

digital photography

F-stop

optical resolution

shutter

shutter speed

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