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.

1 To set a slave unit’s slave ID, press

the < > button and select

.

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

 

 

 

 

 

 

 

 

(Off)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Press the <

 

 

 

> or <

 

 

 

> button to set

2 the slave ID (A, B, or C).

3

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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Canon 550EX manual Setting the Slave ID, Slave ID A, B, or C