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In a modern camera using film, we can see automatic focusing and exposure facilities. The basic elements of the control system used in an automatic camera are body, lenses, and flash. Figure 1 depicts an automatic camera system. Figure 1: Components of an automatic camera Figure 2. Key components of an automatic camera and its block representation Depending upon the model selected, the required combination of aperture and shutter speed and focus are automatically taken care of by the camera.  A typical camera system comprises drives and sensors, interfaces for lenses, flash, and user.  Drives are required for film advance, rewind, shutter movement, focusing, zoom, etc.  The sensors are essentially used for sensing film speed, counters, focus, exposure, zoom, etc. Microprocessor systems for lenses, a user(s), and flash are incorporated for controlling various operations. Figure 3 Working of autofocus system of automatic camera The user is expected to feed information...