Shutter priority automatic exposure mode is

Semiautomatic exposure mode. According to Sohu. Com, shutter priority automatic exposure mode, also known as S mode, is a semi-automatic exposure mode. In this mode, the photographer can choose the shutter speed he wants, and the camera will automatically adjust the aperture size according to this shutter speed to reach the normal exposure level. Shutter priority mode is also often used to shoot dynamic landscapes or portraits to capture specific motion trajectories or expressions.