What does shutter speed contral?

The faster your shutter speed is, the more underexposed (darker) your subject/ scene will be. fast shutter speeds include 1/200th of a second, 1/320, 1/400, 1/500, 1/640, 1/800, 1/1000 and so on. If the shutter is slower (1/30, 1/40, 1/50 1/60, 1/100, 1/160) it will let more light in. with a slower shutter and moving objects, motion blur will occur, which is why a faster shutter is used to take action shots such as sports, and a slower shutter is used in Modeling photography to capture those vivid colors and lights.