580EX II Speedlite : How to prevent the sender unit from firing its flash.

Article ID: ART121075

Date published: 05/12/2015

Date last updated: 11/29/2017

How to prevent the sender unit from firing its flash.

You can disable the sender unit from firing so that only the receiver unit(s) will fire a flash.

	Press the button so that the display blinks as shown on the left
	Disable the sender unit's flash firing Turn the dial to select <OFF> then press the button
	The icon will change to

Even if you disable the sender unit's flash firing, it will still fire a preflash to transmit wireless signals

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