EC works in semi-automatic modes like , Shutter Priority (S/Tv) , or Program (P) .
Exposure Compensation is a tool that allows you to override your camera's automatic metering. Because cameras often try to expose for "middle gray," they may underexpose bright outdoor scenes (like a snowy field) or overexpose dark ones (like a shaded forest). Step-by-Step Guide for Outdoor Exposure
If you prefer shooting in Manual (M) but want flexibility, set your ISO to Auto . You can then use the EC dial to adjust the brightness while keeping your shutter speed and aperture locked.