Canon SPEEDLITE 580EX II Instruction Manual page 44

[l] •
The flash ratio range of8:1 -1:1 -1:8 is equivalent to 3:1 -1:1 -1:3 in
stops (1/2-stop increments).
• The flash ratio under the • mark is shown in parentheses below the scale.
8:1 • 4:1 • 2:1 • 1:1 • 1:2 • 1:4 • 1:8
---------------
(5.6:1) (2.8:1) (1.4:1) (1:1.4) (1:2.8) (1:5.6)
Wireless Flash with Three Slave Groups
Indoors
12m (39.4ft.)
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 10 to <
A
>,
<8>, or <C> .
•
For slave <C>, also set the flash
exposure compensation as necessary.
43