Canon ST-E3-RT-V2 Manual page 51

Settings Available in [Flash function settings]
 EOS digital cameras released since 2012
When using the transmitter with cameras such as EOS-1D X, you can
set the functions for "Radio transmission wireless shooting" in the
[Flash function settings] screen.
* Although EOS REBEL T100/4000D/3000D, EOS REBEL T7/1500D/2000D,
EOS REBEL T6/1300D and EOS REBEL T5/1200D was released since 2012,
the settable functions with [External flash func. setting] are the same as with
EOS digital cameras released from 2007 to 2011. (See the following explanation
for details.)
 EOS digital cameras released from 2007 to 2011
When performing "Radio transmission wireless shooting", set the
functions by operating the transmitter.
The settable functions are as follows. The available settings vary
depending on the flash mode or wireless function setting.
Flash firing
E-TTL II flash
metering
Flash synchronization speed in Av mode
Flash mode
Shutter
synchronization
Flash exposure compensation
FEB
Wireless functions
(setting)
Clear Speedlite function settings
[Flash firing] and [E-TTL II flash metering] are displayed in step 2 or

step 3 on the preceding page (depending on the camera).
When [Flash sync. speed in Av mode] is not displayed, it can be set

with the camera's Custom Function.
Transmitter Control from Camera's Menu Screen
Function
Enable / Disable
Evaluative / Average
E-TTL II (autoflash) / Manual flash /
MULTI flash / Individual group control
1st curtain / High-speed
Radio transmission wireless
Reference
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