1] wireless system setup and testing, Setting the 550ex as the master unit, Setting the 550ex as a slave 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. (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 "[4]
Manual or Stroboscopic Flash With a Slave Unit" on page 110,111.
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 shutter release.
ra The master unit’s flash head zoom setting is set automatically to O iWmm. This gives the
L|l 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.
2. Setting the 550EX as a Slave Unit
(OFFl'l* * 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
unit.”
• The slave unit’s flash head zoom setting is
set automatically to El iWmm.
You can change the slave unit’s flash head zoom setting manually with the ZOOM
L|1 button.
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