Canon 188A User Manual
Page 27
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Automatic Shutter Setting
Autoflash with an FL Lens on the A-1,
AE-1 PROGRAM, AE-1, AL-1. AV-1, AT-1
or F-1
FL lenses do not have the signal pin for full
aperture metering and the aperture cannot
be set automatically The shutter speed,
however, is switched automatically to X-
sync Turn the lens' aperture ring to the
same aperture which is set on the flash