Shutter Speeds
Inside a camera, directly in front of the sensor, is a small flap called the shutter. When someone takes a photo, this opens and closes to let light reach the sensor, creating the image. Shutter speed describes how quickly or slowly the shutter opens and closes again. A fast shutter speed means that the shutter is only open for a short period of time. A slow shutter speed means the shutter is open for longer. Shutter speeds are measured in seconds/fractions of a second.