1] wireless system setup and testing, Setting the 550ex as the master unit – Canon 550EX User Manual
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[1] Wireless System Setup and Testing
The wireless flash system can be setup in one of two ways: @ With a 550EX
set as the master unit and one or more 550EXs set as slave units.
(D
With
Speedlite 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 former. For the latter, refer to the
Instructions for Speedlite Transmitter ST-E2.
1. Setting the 550EX as the Master Unit
Attach the 550EX to the camera and set
the wireless selector to
MASTER
. This
550EX will then be the “master unit.” The
master
unit’s
wireless
signal
is
transmitted to the slave unit(s) at almost
the same time as the preflash.
ra The master unit's flash head zoom setting is set automatically to El iHinm This gives the
L|J
wireless signal the maximum coverage of 80° You can also press the Zoom button to
change the zoom setting manually However, this will narrow the wireless signal’s
coverage.
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