Canon Speedlite 550EX Instructions Manual page 106

Wireless Flash Range
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106
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Check that the master unit's pil ot
lamp is lit and that the slave unit(s)
are recharged and ready.
When a slave unit is ready. its AF-assist
beam blinks once per second .
Press the master unit's pilot lamp
(test firing button) to fire a test flash.
When the wireless transmission works. the
slave unit fires at the flash outpul that was
set.
If a slave unit does not tire. place it closer to
the master un it or ang le the sensor more
toward the master unit and try again.
In a wireless flash system. all the settings can be set with the master unit. The master
unit transmits all these settings to the slave units by wireless signals. Control li ng slave
unit(s) is the same es controlling one on-ca.mera Speedlite.
Make sure the slave
un~s
are within the effedlve range of
the
master unit.
After the picture is taken, the slave unit's operat ion result is displayed on the LCD
panel.
With the slave unit's main switch set to SE (Save Energy), the slave unit turns off
automatically if it is left unused lor over 60 minutes". Wh il e the slave
un~
is off due to
this SE mode, SE is displayed on the LCD panel. Within 1 hour" after the slave un it
turns off in the SE mode. the slave unit can be turned on again by pressing the master
unit's test firing button.
If the manual flas h mode has bIHln set and you press the master unifs pilot lamp, all
the slave units will fire a test flash simultaneously at the manually-set flash output.
After pressing the shutter button halfway. lest
firing
cannot be eXlICuted during the first
6 sec. when the came ra is metering the scene.
Custom Function CF·4 can change this to 10 minutes. See page 113.
Custom Function CF·5 can change this to 8 hours. See page 113.