Attaching the Control Unit 
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2
Loosen the locking ring.
Turn the locking ring as shown by the arrow to loosen it.
Attach the control unit.
Slip the control unit’s mounting foot into the camera’s hot shoe all the way.
3 Tighten the locking ring.
Turn the locking ring as shown by the arrow. The locking pin will then protrude from the mounting foot.
To detach the control unit, loosen the locking ring until the locking pin retracts, then detach the control unit.
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