Canon Speedlite 600EX-RT Instruction Manual page 51

Wireless Multiple Flash Shooting
You can divide the slave units into two or three groups and perform
E-TTL II/E-TTL autoflash shooting while changing the flash ratio
(factor). In addition, you can set and shoot with a different flash mode
for each firing group, for up to 5 groups.
Autoflash Shooting with Two Slave Groups
Autoflash Shooting with Three Slave Groups
' Radio Transmission Wireless Flash Shooting
A
C
A
(p.61)
B
B
(p.62)
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