the camera's other functions including the focusing motor in the lens, are powered by 4 AAA batteries housed in the base of the camera. AC lenses Three special autofocus AC lenses were produced for the T80. Each lens contains a motor to focus, unlike the body-integral AF system pioneered by Minolta. All are readily identifiable by a boxy area on the upper left (viewed from the camera) containing the motor, and a red ring around the front lens element. The lenses are: AC 50mm f/1.8 AC 35-70mm f/3.5-4.5 AC 75-200mm f/4.5 All three, like the T80 itself, were only produced for a short time and are rare. The auto-focus function does not work on any other camera, although they can be used as manual-focus FD lenses. However they lack aperture rings, so they are only useful on FD camera bodies that could control the aperture from the body. There is one other Canon FD autofocus lens, the Canon New FD 35-70 mm f/4 AF. This was introduced in 1981, and uses a similar autofocus system to the T80's lenses, with an integral autofocus motor. The lens has a self-contained autofocus system that does not require autofocus electronics in the camera body. Canon, unlike Minolta and Nikon, was convinced that having the motor in the lens was the optimal approach; this line of thinking continued with the new EOS system in 1987, which remains Canon's standard mounting system for SLRs today. Data back A Command Back 80 was available for the T80. Like the similar back available for the T90, it supports date stamping of images, alphanumeric coding of images, time exposures and time-lapse interval exposure. See also Canon AC Mount References Canon T80 Camera at Photography in Malaysia. External links T80