Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 232)

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Easy Wireless Flash Shooting
4 Select [Built-in flash settings].
Select [Built-in flash settings], then
press <0>.
5 Select [EasyWireless].
Under [Built-in flash], select
[EasyWireless], then press <0>.
6 Set [Channel].
Set the transmission channel (1-4) to
the same one as the slave unit.
7 Take the picture.
Set the camera and take picture in
the same way as with normal
shooting.
8 Exit the wireless flash shooting.
For [Built-in flash], select
[NormalFiring].
Setting [E-TTL II meter.] to [Evaluative] is recommended.
Even though the firing of the built-in flash is disabled when
[EasyWireless] is set, it will still fire a small flash to control the slave unit.
Depending on shooting conditions, the flash fired to control the slave unit
may appear in the picture.
Firing a test flash is not possible with the slave unit.
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