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[1] Wireless System Setup and Testing
The wireless flash system can be setup in one of two ways: 1 With a 550EX
set as the master unit and one or more 550EXs set as slave units. 2 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.
Attach the 550EX to the camera and set
the wireless selector to . 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.
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1. Setting the 550EX as the Master Unit
The master unit’s flash head zoom setting is set automatically to . This gives the
wireless signal the maximum coverage of 80°. You can also press the button to
change the zoom setting manually. However, this will narrow the wireless signal’s
coverage.
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