Canon Speedlite 600EX-RT Mode D'emploi page 89

Slave Group Control
Firing group A
Gr = A Gr = A
For example, if you set a firing group with three slave units to <4>,
the three units are treated and controlled as a single firing group A with
a large flash output.
To fire the three firing groups A, B and C at the same time, set
<^>. With the <%> setting, firing group C does
not fire.
If you shoot with firing group C pointing directly toward the main subject,
overexposure may result.
In some EOS film cameras that support E-TTL autoflash, you cannot
perform multiple flash wireless shooting with a flash ratio setting.
The flash ratio of 8:1 to 1:1 to 1:8 is equivalent to 3:1 to 1:1 to 1:3 (1/2-
stop increment) when converted to number of stops.
The details of the flash ratio settings are as follows.
a: Wireless Multiple Flash Shooting with Flash Ratio
Set flash exposure compensation
3
as required.
If you need more flash output or wish to
perform more sophisticated lighting, you
can increase the number of slave units.
Simply set an additional slave unit to the
firing group (A, B or C) whose flash
Gr = A
output you want to increase. There is no
restriction on the number of units.
Press function button 3 <F>,
turn <9> and select <6>.
Press function button 3 <B>.
Turn <9> to set the flash exposure
compensation amount, and press the
<8> button.
Press function button 4 <?> to
return to the shooting-ready state.
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