Aperture
In optics, an aperture is a hole or an opening through which light travels. In Photography this can be measured in increments called f-stops.
Exposure control
The size of the aperture and the brightness of the scene controls the amount of light that enters the camera during a period of time, and the shutter controls the length of time that the light hits the recording surface. Equivalent exposures can be made with a larger aperture and a faster shutter speed or a corresponding smaller aperture and with the shutter speed slowed down.
Powerpoint by Tim.H
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