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Cameras are devices that record light or other electromagnetic radiation onto a photosensitive surface or digital sensor in order to capture still or moving images. They have evolved substantially over the years and are available in a variety of sorts and shapes, ranging from traditional film cameras to current digital cameras. Here are some important camera facts. The lens directs light onto the sensor or film of the camera. Lenses can be used for a variety of purposes, including wide-angle, telephoto, and macro photography.