Canon Speedlite 430EX II - Manual (Page 31)

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Set the slave ID if you use two (A and B) or three (A, B, and C) slave
groups.
1 Press the <G> button
so that <x> blinks.
2 Set the slave ID.
Press the <9> button to select the
slave ID (A, B, or C), then press the
<8> button.
If the camera has a depth-of-field preview button, pressing it will fire the
flash continuously for 1 sec. This is called the modeling flash.
It enables you to see the shadow effects on the subject and the lighting
balance. You can fire the modeling flash for both wireless and normal
flash shooting.
Setting the Slave ID
Modeling Flash
Do not fire the modeling flash more than 10 consecutive times. If you
fire the modeling flash 10 consecutive times, allow the Speedlite to
rest for at least 10 min. to avoid overheating and deteriorating the flash
head.
The modeling flash cannot be fired with the EOS REBEL 2000/300 and
Type-B cameras (p.2).
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