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
 

Description

How to prevent the sender unit from firing its flash.

Solution

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

SIMS Doc Id

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