What does ev mean in front of the camera?

EV(EV value) is the abbreviation of exposure value in camera, which is usually used to represent the measure of exposure. Refers to the brightness of light sensed by the exposure camera when the aperture value and shutter speed are the same, and the unit is exposure value (EV). The range represented by EV value is the brightness of shooting. The bigger exposure value is, the brighter the photos are, and vice versa.

EV value is helpful to judge the brightness of current light, and the brightness of photos can be controlled by properly adjusting exposure value. EV value is often used in high dynamic range (HDR) shooting to ensure the balance and unity of color and brightness of the shot image. In addition, the EV value is also very helpful for shooting portraits, buildings and other scenes. Because these subjects often face various light changes, the shooting scene can be better controlled by adjusting the EV value.

Usually, the camera can get the brightness value of the environment through the metering mode, so as to get the EV value. The metering modes of most cameras are one-point metering, central weighted metering and evaluation metering. Through different metering modes, more accurate EV values can be obtained. In addition, some cameras can also display the current EV value when shooting, and the camera display screen will display the brightness of the shooting environment in real time, which is convenient for photographers to better control the exposure parameters.