Canon Speedlite Transmitter ST-E3-RT - Manual (Page 52)

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Transmitter Control from Camera’s Menu Screen
Flash firing
To perform wireless flash shooting, set to [Enable]. When [Disable]
is set, wireless flash shooting is not available.
E-TTL II flash metering
For normal exposures, set it to [Evaluative]. If [Average] is set, the
flash exposure will be averaged for the entire scene metered by the
camera. Flash exposure compensation may be necessary
depending on the scene. This setting is for advanced users.
Flash synchronization speed in Av mode
You can set the flash sync speed when performing wireless flash
shooting in aperture-priority AE (W) mode.
Flash mode
You can select the flash mode from [E-TTL II], [Manual flash],
[MULTI flash] and [Individual group control] to suit your desired
flash shooting.
Shutter synchronization
You can select the flash firing timing/method from [1st curtain] and
[High-speed synchronization]. To perform normal wireless flash
shooting, set it to [1st curtain].
Flash exposure compensation
In the same way as normal exposure compensation, you can set
exposure compensation for flash. The flash exposure compensation
amount can be set up to ±3 stops in 1/3-stop increments.
FEB
You can take three shots while automatically changing the flash
output. The settable range is up to ±3 stops in 1/3-stop increments.
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