Canon Speedlite 58OEX Instruction Manual page 38

Flash Ratio with E-TTL II
With one master unit and one or two slave units off-camera, you can adjust the
flash ratio for E-TIL " autoflash shooting.
The example below has two slave units and the master unit disabled from
firing.
Indoors
A~
12m (39.4ft.)
Set the Slave Unit
Multiple slave units can be assigned to different slave groups by setting the
slave 10.
ETTL
38
:::K)
~r=
Z....
1
Set the wireless selector to
<SLAVE>.
(p.34)
Press the
<ZOOM/~>
button so
that
<~>
blinks.