Any camera is made up of four basic things.
Body The camera body is a light-tight box that holds and transports photographic film, and includes a shutter release button used to take the picture. The camera body may be as simple as an old fashioned pinhole camera or as sophisticated as a modern single lens reflex with high tech light metering systems and built in mini-computers. Lens The lens collects and focuses light rays, transmitting them into the camera body and onto the film. The shutter controls the length of time that light is allowed to pass through the lens and onto the film. Focal plane shutters are located within the camera body, and leaf shutters are located within the lens.