Canon Speedlite Transmitter ST-E3-RT - Manual (Page 53)

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Transmitter Control from Camera’s Menu Screen
Wireless flash functions (setting)
Radio transmission wireless flash shooting is set automatically. For
details, see Chapter 2.
Clear Speedlite (function) settings
You can return the transmitter settings to their default settings.
When [Flash mode] is set to [Individual group control], you can select
[E-TTL II], [Manual flash], [Auto external flash metering] or [Disable]
as the flash mode for each group.
When flash exposure compensation is set on the transmitter, you cannot
set flash exposure compensation in the camera’s menu screen. Note that
if both are set at the same time, the setting on the transmitter is given
priority.
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