Canon MACRO RING LITE MR-14EX II Mode D'emploi page 48

: Wireless Multiple Flash Shooting
Slave Group Control
Slave A is controlled to fire with flash tube A and slave B to fire with
flash tube B as a group (as a single flash unit). Multiple units can be
used as slave C. There is no limit for the number of units that can be
used as slave A, B, or C.
Slave C
Firing group C
Slave A
Slave B
Firing group B
Firing group A
Flash tube B Flash tube A
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