Canon SPEEDLITE 430EX Manual De Instrucciones página 30

Setting Manual Flash with the Slave Unit
Manual flash can be set manually with the slave unit. Do this in the
following cases:
(1) When you want to set the flash output with the slave units
individually for wireless or manual flash, as with studio flash units.
(2) When you use Speedlite Transmitter ST-E2 for wireless or manual
flash.
Press the <D> button for 2 sec.
<q> will blink.
Set the manual flash output (p.19).
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