Canon 7 How To Use Manual page 27

Perfect electrical contact is made when the caIl0rl Flash Unit Model V-2
is attached to the flash unit connector socket. No external wiring is
necessary and all synchronization is done automatically in the camera
itself.
To extend the flash unit from the camera, or to connect a speedlight
unit of non-Canon make, use a Canon Extension Cord Va (15-
ft.) or Vb (3-ft.)
When using a clip-on-type Speedlight on the
Canon 7, the Canon Flash Unit Coupler
Accessory Coupler, should be used
Canon Accessory Coupler, which has an
accessory clip, is used also to couple the
viewfinder when using 25mm or 28mm lens
or other accessories with a shoe.
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