Canon Canon Speedlite 600EX RT 1, 2, 3, 4

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This section describes basic fully
automatic wireless shooting when using
a 600EX-RT attached to the camera
(master) and a 600EX-RT wirelessly
controlled (slave).
1Set the master unit.
Set the 600EX-RT attached to the
camera as the master unit (p.52).
You can also use a Speedlite
Transmitter ST-E3-RT (sold
separately) as the master unit.
2Set the slave unit.
Set the 600EX-RT to be controlled
wirelessly as the slave unit (p.52).
Set A, B or C as the firing group. The
flash will not fire if it is set to D or E.
3Check the channel and ID.
If the channels and IDs of the master
unit and slave unit are different, set
them to the same numbers (p.53, 54).
4Position the camera and the
flash.
Position them within the range shown
on page 48.
a : Fully Automatic Wireless Flash Shooting
Autoflash Shooting Using One Slave Unit