Canon Speedlite 550EX Instructions Manual page 14

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4.
Wireless Selector
The
wireless selector has
three
settings as shown below.
..,
K>..i'
0))
OFF
°1°
SLAVE
STER
'4 ...
(
0
»
eel-
5 '$E
MASTER
14
Set to OFF to use
the
550EX
as
a
normal,
on-camera Speedlile.
Set to MASTER to use the 550EX as thE
master unit
in
a
wireless,
mu lti-SpeedlitE
system
.
Set to SLAVE to use
the
550EX
as
<
slave unit in a wireless, mulli-SpeedlilE
system.

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