Canon Speedlite 600EX II-RT Manual (en)

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You can divide the slave units into two 
firing groups, A and B, and adjust the 
lighting balance (flash ratio) for shooting.
The exposure is controlled automatically 
so that the total flash output of firing 
groups A and B results in the standard 
exposure.
1
Set the firing group of the slave 
units.
 
Operate and set the slave units one by 
one.
 
Press function button 4 to display 
<M>.
 
Press function button 3 <F>, 
then select <f> or <g>.
 
Set one unit to <f> and set the 
other to <g>.
2
Set the master unit to <u>.
 
Operate and set the master unit with 
the procedures in steps 2 and 3.
 
Press function button 4 on the master 
unit to display <N>.
 
Press function button 2 <T> and 
set to <u>.
5
: Wireless Multiple-Flash Photography with Flash Ratio
Autoflash Photography with Two Slave Groups
A
B