Canon EOS Rebel T5i 18-55mm IS STM Lens Kit 手册

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Custom Wireless Flash Shooting

Multiple Speedlite slave units can be treated as one flash unit or 
separated into slave groups whose flash ratio can be set.
The basic settings are shown below. By changing the [Firing group] 
setting, you can shoot with various wireless flash setups with multiple 
Speedlites.

E-TTL II meter. : Evaluative
Wireless func. :0
Channel

: (Same as slave units)

[1All] Using multiple slave Speedlites as one flash unit

This is convenient when you need a 
large flash output. All the slave units will 
fire at the same output and be controlled 
to obtain a standard exposure.
No matter what the slave ID is (A, B, or 
C), all the slave units will fire as one 
group.

Set [Firing group] to [1All], then 
take the picture.