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This method has all the Speedlites fire at the same flash output with E-
TTL II autoflash controlling the total flash output.
1
Set the camera-attached 580EX II
as the master unit.
2
Set the other 580EX II
Speedlites(s) as the wireless
slave unit(s).
3
Check the communication
channel.
If the master unit and slave unit(s) are
set to a different channel, set them all
to the same channel (p.40).
4
Position the camera and
Speedlites.
Position the Speedlites within the
range shown on the next page.
5
Set the master unit’s flash mode
to <a>.
For shooting, <a> will also be
set automatically for the slave unit(s).
6
Check that the flash is ready.
When the slave unit(s) is ready to fire,
the AF-assist beam will blink at 1-sec.
intervals.
Fully Automatic Wireless Flash
A65_03.fm Page 37 Thursday, November 23, 2006 1:27 PM