Canon Speedlite 430EX III-RT - Manual (Page 59)

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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 < 8 >.
Turn < 9 > to select the firing group
symbol, then press < 8 >.
Turn < 9 > to select < a > or < b >,
then press < 8 >.
Set one unit to < a >, and the other
unit to < b >.
2
Set the master unit to < 5 >.
The procedures in steps 2 to 3 are to
be set on the master unit.
Press < 8 >.
Turn < 9 > to select the firing group
control symbol, then press < 8 >.
Turn < 9 > to select < U >, then
press < 8 >.
5 : Wireless Multiple Flash Shooting with Flash Ratio
Autoflash Shooting with Two Slave Groups
A
B
Firing groups
Firing group control