Canon EOS 70D(W), Instruction Manual, Page: 207 / 468

207
Using Wireless Flash
N
4
Set [Flash mode: E-TTL II].
Set [ Flash mode ] to [ E-TTL II ].
5
Set [Wireless func.:
0
].
Set [ Wireless func. ] to [
0
].
6
Set [Channel].
Set the channel (1-4) to the same one
as the slave unit.
7
Set [Firing group:
1
All].
Set [ Firing group ] to [
1
All ].
8
Take the picture.
Set the camera and take the picture
in the same way as with normal flash
shooting.
To terminate wireless flash shooting,
set [
Wireless func. ] to [ Disable ].
Setting [ E-TTL II meter. ] to [ Evaluative ] is recommended.
Firing a test flash is not possible with the slave unit.