Canon 550 EX - Manual (Page 103)

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4. Setting the Slave ID
With multiple slave units, a slave ID can be assigned to distinguish a slave
unit as being the main flash or fill flash. A flash ratio can thereby be set. Three
slave IDs are available: A, B, and C.
To set a slave unit’s slave ID, press
the <
> button and select
.
• Pressing the < > button changes
the selection in the following loop:
Press the < > or < > button to set
the slave ID (A, B, or C).
Press the < > button.
• The icon and slave ID will be
displayed.
If you want all the slave units to fire at the same flash output, you need not assign a slave
ID.
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