Canon EF Instructions Manual page 40

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BASIC OPERATION
CAT SYSTEM
well-exposed shots. Therefore, the CAT System of
electronic flash photography is as easy as normal AE
photography. For electronic flash units requiring the
use of an external PC cord, a sync terminal with a
spring-loaded plastic cover is provided on the left
end of the camera. When using flash bulbs, a
reflector-type holder, such as the folding Canon
Flash V3, can be mounted into the flash hot shoe.
M, MF, and FP flash bulbs synchronize at 1/15 sec.
and below.
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