How Does EV Work?
Evaluative metering is the term used to describe how the camera divides an image into different zones for light metering — it evaluates the lighting conditions and makes adjustments to exposure based on the position of the subject, the brightness, direct light and backlighting, and a multitude of other factors. Essentially, evaluative metering performs the same functions as the human eye. However, cameras are not as perfect at adjusting exposure as our eyes. In overly bright or underlit conditions, a little manual compensation is required. Exposure values are the numeric values (+1, -2, etc) which describe a particular combination of shutter speed and lens aperture. On most cameras the exposure values are measured at one-half or one-third stops. The default or no-compensation level is set at 0. By raising or lowering EV from 0, you adjust the shutter speed/lens aperture which allows either more or less light to reach the camera’s sensors, thereby brightening or darkening your photograp
