Canon Speedlite 430EX III-RT - Manual (Page 55)

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This section describes the basic fully
automatic wireless shooting when using
a 430EX III-RT attached to the camera
(master) and a 430EX III-RT set as a
slave unit.
1
Set the master unit.
Set the 430EX III-RT attached to the
camera as the master unit (p.50).
You can also use a device equipped
with the radio transmission wireless
master function as the master unit.
2
Set the slave unit.
Set the 430EX III-RT to be controlled
wirelessly from the master as the
slave unit (p.50).
Set the firing group to A, B, or C (p.59).
The flash will not fire if it is set to D or E.
3
Check the channel and ID.
If the transmission channels and
wireless radio IDs of the master unit
and slave unit are different, set them
to the same settings (p.51, 52).
4
Position the camera and the flash.
Position them within the range shown
on page 46.
a : Fully Automatic Wireless Flash Shooting
Autoflash Shooting Using One Slave Unit
Firing group