Canon 550EX manual Master Flash ON/OFF, Press Or button to set Either Press the button

5. Master Flash ON/OFF

The master unit’s flash firing can be enabled (ON) or disabled (OFF).

(1) ( ) : This setting enables the master unit to fire a flash.

•This setting is called “Master flash ON.”

•This setting automatically sets the master unit’s slave ID to A.

(2) ( ) : This setting (Master flash OFF) prevents the master unit from firing a flash. It can still transmit wireless signals to trigger the slave units.

1 Press the < > button and select .

• Pressing the < > button changes the selection in the following loop:

		(Off)
2 Press the <		> or < > button to set
either	or	.

3 Press the < > button.

• or will appear.

• If master flash OFF is set, will blink.

Even if master flash OFF is set, the master unit still transmits the wireless signal to fire the slave units.

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