Exposure
The lens aperture and shutter can control the light striking the light sensor, but to do the job properly, they need to be carefully controlled. A sunny day may be 10,000 times brighter than a dark room, yet the camera's light sensor is called upon to register minute differences in each. At one time, photographers had to guess at the correct aperture and shutter speed settings. Light meters that measure the brightness of individual scenes gave them a tool to objectively evaluate the proper shutter and aperture settings. Automatic exposure systems directly link the light meter to the exposure-regulating controls of the camera so you don't have to worry about adjusting the settings at all.
Sensing
Making an automatic exposure system work ...
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