Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 183)

183
Wireless Flash Photography Using Optical Transmission
4 Set to [Flash mode: E-TTL II].
5 Set [Wireless func.] to [ 0 ].
6 Confi gure [Channel].
 Set the same optical channel (1–4) as
the receiver.
7 Set [Firing group] to [ 1 All].
8 Take the picture.

Just as in normal fl ash photography,
shoot after confi guring the camera.

To stop wireless fl ash photography, set
[Wireless func.]
to
[Disable]
.