Camera Basics A camera captures light photons, usually from the visible spectrum for human viewing, but in general could also be from other portions of the electromagnetic spectrum. All cameras use the same basic design: light enters an enclosed box through a converging or convex lens and an image is recorded on a light-sensitive medium (mainly a transition metal-halide). A shutter mechanism controls the length of time that light can enter the camera. Most photographic cameras have extra functions that allow to a person to view the scene to be recorded, a desired part of the scene to be in focus, and control of exposure so that it is not too bright or too dim. On most digital cameras a display, often a liquid crystal display (LCD), permits the user to view the scene to be recorded and settings such as ISO speed, exposure, and shutter speed. There are following types of Cameras available in present market. 1. Compact Camera 2. DX Format Camera 3. FX Format Camera 4. Medium Format...