Canon Speedlite 580EX II - Manual (Page 44)

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You can have slave groups A and B and also add slave group C. You can use
slave groups A and B to obtain the standard flash exposure of the subject,
and slave group C to illuminate the background to eliminate shadows.
1
Set the slave units.
See “Setting the Slave Units” on page
41 to set the slave unit’s ID to <1>,
<2>, or <3>.
For slave <3>, also set the flash
exposure compensation as necessary.
Wireless Flash with Three Slave Groups
The flash ratio range of 8:1 - 1:1 - 1:8 is equivalent to 3:1 - 1:1 - 1:3 in
stops (1/2-stop increments).
The flash ratio under the Z mark is shown in parentheses below the scale.
(5.6:1) (2.8:1) (1.4:1) (1:1.4) (1:2.8) (1:5.6)
A
C
B
10m (32.8ft.)
8m (26.2ft.)
80 o
12m (39.4ft.)
15m (49.2ft.)
Indoors
Outdoors
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