580EX II Speedlite : How to set the communication channel on the Speedlite.
Article ID: ART121077
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Date published: 05/12/2015
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Date last updated: 11/29/2017
Description
How to set the communication channel on the Speedlite.
Solution
Setting the communication Channel
If there is another Canon wireless flash system nearby, you can change the channel number to prevent signal confusion. the sender and the receiver units must be set to the same channel number.
Press the button to that <CH> blinks
Set the channel number
Turn the dial to select the channel number, then press the button