Speed

In the manual setting, its the right combination of aperture and speed that will yield the correct exposure. I tend to use speed as a creative toolif I want my subject to be sharp and motionless Ill go to a higher shutter speed 1 125th or 1 250th. Or if I want to convey or capture motion, e.g., fish swimming, a slower shutter speed of 1 15th or lower is the way to go.