The Canon T80, introduced in April 1985 and discontinued in June 1986, was Canon's first autofocus 35mm single-lens reflex camera. It was 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 could also be used, but without autofocus capabilities.
The autofocus system in the T...
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The Canon T80, introduced in April 1985 and discontinued in June 1986, was Canon's first autofocus 35mm single-lens reflex camera. It was 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 could also be used, but without autofocus capabilities.
The autofocus system in the T80 worked 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 non-autofocus lens was used, the camera provided focus assistance in exactly the same manner as the AL-1.
The autofocus lenses contained a motor, and electrical contacts in the lens mount connected this motor to the camera's circuits.
Except for its autofocus...
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