Canon Speedlite 600EX II-RT Manual (en)

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59
' Radio Transmission Wireless Flash Photography
You can divide the slave units into two or three groups and perform 
E-TTL II/E-TTL autoflash photography while changing the flash ratio 
(flash output rate).
In addition, you can set and shoot in a different flash mode for each 
firing group with up to 5 groups (p.60).
 
Autoflash Photography with Slave Groups
Wireless Multiple Flash Photography
A
B
A
B
C
2 (A, B) groups
 (p.73)
3 (A, B, C) groups
 (p.75)
 
The transmission distance may be shorter depending on the conditions 
such as the positioning of slave flashes, the surrounding environment, 
and weather conditions.
 
Before shooting, perform a test flash (p.21) and test shooting.