Canon EX Auto Canon EX Auto with 50 mm (fitted), 35 mm and 125 mm lenses The EX Auto is a 35 mm SLR camera made by Canon in 1972. Its most characteristic feature is a rear lens-group fixed on the camera, to which any of a small selection of front groups can be attached (by a simple screw fitting). McKeown mistakenly lists the EX Auto as a name variant of the Canon EXEE, and dates it to 1969, the date the EXEE was introduced. It is actually a modest improvement on the EXEE. Like the EXEE, the Auto offers through-the-lens metering and shutter-priority AE, but unlike the previous model, the camera detects the maximum aperture of the different lens front-groups (the EXEE requires manual setting of the maximum aperture to f/1.8 or f/3.5 at the film-speed dial). The shutter speed is set on a dial next to the release button. The aperture is set not on the lens, but on a dial around the rewind crank, between f/1.8 and f/16; there are also 'Auto' and 'Off' positions. The aperture set is displayed in the viewfinder on a scale with a needle.