Shutter speed controls the amount of time that light is allowed to hit the camera's film or sensor. Faster shutter speeds of 1/60th of a second or higher will freeze motion, while slower speeds of 1/30th of a second or lower will blur motion. Special techniques like panning, spinning the camera, or using light trails can be used with slow shutter speeds. Night photography requires slow shutter speeds, so a tripod is recommended to avoid camera shake. Flash can also be used with slow shutter speeds to capture both stopped and blurred motion.