Canon Speedlite 580EX II Instruction Manual page 43

Setting the Master Unit and Shooting
With the EOS ELAN ll/ELAN ll E/50/50E, EOS REBEL G/500N, EOS IX,
EOS IX Lite/IX7, EOS REBEL 2000/300, and REBEL XS N/ REBEL G ll/
EOS 3000N/66, the flash ratio cannot be set with multiple Speedlites.
42
Set the slave ID.
3
Press the <8> button.
Slave ID <1> will be set.
For the other slave unit, do steps 1
and 2, turn the <9> dial to select
<2>, then press the <8> button.
Slave ID <2> will be set.
Set the wireless mode to
1
<M>.
Disable the master unit's flash
2
firing.
(p.39)
Press the <G> button
3
so that <y> blinks.
Select the flash ratio.
4
Turn the <9> dial to select <l>,
then press the <8> button.
Set the flash ratio.
5
Turn the <9> dial to set the flash
ratio.
Set the camera and shoot.
6
Set the camera in the same way as
with normal flash shooting.
(p.36)