Canon Speedlite 600EX-RT - Manual (Page 79)

77
:Optical Transmission Wireless 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).
Autoflash Shooting with Two Slave Groups
(p.85)
Autoflash Shooting with Three Slave Groups
(p.86)
Wireless Multiple Flash Shooting
B
A
B
A
C
Before shooting, perform a test flash (p.16) and test shooting.
To avoid interfering with transmission, do not place any obstacles
between the master unit and slave units.
COP
Y