The Canon T80 is Canon's first autofocus 35mm single-lens reflex camera. It was introduced in April 1985 and discontinued in June 1986 and is part of the T series of FD mount cameras. It is not compatible with Canon's later EOS system and its autofocus EF-mount lenses. Three special lenses, designated AC, were produced specifically for the camera. Other FD-mount lenses can also be used, but without autofocus capabilities. Autofocus The autofocus system in the T80 works in the same manner as the focus assist system built into the earlier AL-1. A linear CCD is used to detect contrast in the focus area. When this area has the maximum contrast, the lens is in focus. This is a similar mechanism to that used in compact digital cameras. When a manual focus lens is used, the camera provides focus assistance in exactly the same manner as the AL-1. The autofocus lenses contain a motor, and electrical contacts in the lens mount connect this motor to the camera's circuits. Auto exposure and scene modes Except for its autofocus capability, the T80 is very similar to the earlier T70, with four programmed scene modes in addition to regular Program auto-exposure (AE). These are: Deep Focus – the camera chooses a narrow aperture in order to get more depth of field. Useful for landscapes, or other situations when the photographer needs to get everything in reasonable focus. Trades off against a slow shutter speed. Shallow Focus – the camera chooses a wide aperture to get a shallow depth of field. Useful for portraiture, to reduce background distractions. Stop Action – the camera chooses a fast shutter speed so that movement is stopped. Useful for sports, wildlife, children etc. Flowing – the camera chooses a longer shutter speed for deliberate motion or panning blur. Program – the camera has more freedom of choice. Tends to prefer reasonably quick shutter speeds for minimal blurring. Film transport Film transport in the T80 is completely automatic, just as in the T70, in both directions. This leaves the top of the camera very clean, since there is no advance lever or rewind knob. Film loading is automatic; the user only has to align the film leader with an orange mark and close the back, and the camera loads and advances the film automatically. Indicators on the top LCD display the status of loading, winding and rewinding. The motor, and