Canon Speedlite 600EX II-RT Manual (en)

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To perform optical transmission wireless shooting, set the master unit 
and slave unit with the following procedure.
Set to <:M>.
 
Press the <I> button.
 
Turn <9> to select 
<:
M
>, then press <8>.
Set to <:x>.
 
Operate and set the flash you want to 
set as the slave unit.
 
Select <:
x
> in the same 
way as for the master unit setting.
Wireless Settings
Master Unit Setting
Slave Unit Setting
To perform normal flash photography, select <F> to clear the 
wireless (master/slave) settings.