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AE Lock Pin
Instead of an “A” mark, some earlier FD lenses have a small green circle on the aperture ring for AE photography. Its use is the same as that of the “A” mark, and the procedure is the same as that described above except that some of these lenses may not have an AE lock pin for locking the aperture ring at the automatic setting.
AE Mode Selector
The AE mode selector has two possible settings, TV (time value) and Av (aperture value). When the AE mode selector is switched to TV, the camera is set for the shutter priority AE mode. You set the shutter speed and the camera selects the aperture. When switched to Av, the camera is set for aperture priority. Here you set the aperture, and the camera automatically selects the shutter speed.
The AE mode selector click stops at