Canon MT-26EX-RT Macro Twin Lite - Manual (Page 61)

61
' Radio Transmission Wireless Multiple Flash Photography
Slave A is controlled to fire with flash head A and slave B to fire with
flash head B as a group (as a single flash unit). Multiple units can be
used as slave C, D, and E. You can increase the number of slave units
up to 15 units.
Group Control
Slave C Slave D Slave E
Firing group C Firing group D Firing group E
Slave B Slave A
Firing group B Firing group A
Flash head B Flash head A