Canon Speedlite Transmitter ST-E3-RT - Manual (Page 42)

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Clearing Transmitter Settings/Test Flash from a Slave Unit
5
Take the picture.
X Each slave unit fires in the flash mode
that was set for each group.
You can return the settings for wireless shooting to their default
settings.
Press function buttons 2 and 3
simultaneously for 2 seconds or
longer.
X The transmitter settings are cleared
and the shooting mode returns to
<a> flash mode.
You can fire a test flash from a flash set as a slave unit. For the
operations, see the flash’s instruction manual.
Clearing Transmitter Settings
When the flash mode of the firing group is set to <a> or </>,
exposure is controlled to obtain a standard exposure for the main subject as
a single group. If you shoot with multiple firing groups pointing toward the
main subject, overexposure may result.
The firing groups to be fired do not need to be consecutive; for example, A/
C/E can be set.
Test Flash from a Slave Unit
Even when the settings are cleared, the transmission channel, the wireless
radio ID and the C.Fn and P.Fn settings (p.54) are not canceled.
When two or more units are set to master, the master unit with the <D>
lamp lit in green is the one that fires.
COP
Y