A camera control that lets you make the automatic exposure brighter or darker than the meter suggests. It is used in automatic and semi-automatic modes such as aperture priority and shutter priority. It is measured in stops, or EV, for example +1 or -0.7. Plus values give more light and a brighter picture. Minus values give less light and a darker picture. It is useful when the meter is fooled, for example by snow, a bright sky or a dark background.
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