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Canon T80
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, and is not compatible with Canon's later EOS system and its autofocus EF-mount lenses. Instead, three special lenses, designated ''AC'', were produced 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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