Canon Speedlite 550EX Instructions Manual page 100

(1) Wireless System Setup and Testing
The wireless flash system can be setup in one of two ways:
CD
With a 550EX
set as the master unit and one or more 550EXs set as slave units.
®
With
Speedlile Transmitter ST-E2 (sold separately) used as the master unit and
one or more 550EXs set as slave units.
This section describes the procedure for the forme r. For the laller, refer to "[4J
Manual or Stroboscopic Flash With a Slave Unit" on page 110,111 .
100
1. Setting the 550EX as the Master Unit
- -z."i[
0
»
(OFF)
T
SLAVE
MASTER
Attach the 550EX to the camera and set
the wireless selector to
MASTER .
This
550EX wililhen be the umasler unit.~ The
master unit's wireless signal is
transmitted to the slave unil(S) at almost
the same time as the shutter release.
~
The master unit's nash head zoom setting is set eutomatically to
iii
2'1 ....
This
gives the
l...jI
wireless signal
the maximum coverage 0180'. You
can also press the Zoom
bunon
to
change the
zoom
setting manually, However. this will nallow the wireless slgnal's
coverage.
2. Setting the 550EX as a Slave Unit
-z."i€ 0)
(OFF)
T
SLAVE
MASTER
Set the wireless selector to SLAVE on
the 550EX to be used as a slave unit. A
550EX set in
this way is called a ·slave
uni l.~
Tho
slave unit's flash
head ~oom
setting is
set automatical ly to
I!:I
2'1 .....
['§l You cen
change the slave un"'s Ilash head
~oom
setting manually with the ZOOM
l...Il
bYtton.