When adjusting, add and subtract EV to control a function specially designed for automatic exposure camera, and manually compensate the exposure value calculated by the camera metering system. When the subject is in front of a large highlight background (large backlight) or a large shadow background, or when there are a large number of bright and dark objects.

If the exposure is only based on the result of the built-in metering mode of the camera, the exposure error of the subject will be caused. In this case, only by using the exposure compensation function can the subject be exposed correctly. Generally speaking, the maximum range of exposure compensation function includes plus or minus 3 levels and plus or minus 5 levels, which are usually expressed as 3 ev and 5 ev. The minimum amplitude is 1/3, 1/2 or 1, which are represented by 1/3EV, 1/2EV and 1EV respectively. At present, most digital phase codes have exposure compensation function. DC fever/ glossary/glossary? glossaryID=24