Canon Speedlite Transmitter ST-E3-RT - Manual (Page 58)

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C: Setting Custom Functions
C.Fn-01: # (Auto power off)
When the transmitter is not operated for 5 min., the power turns off
automatically to save energy. You can disable this function.
0: ON (Enabled)
1: OFF (Disabled)
C.Fn-02: $ (Modeling flash)
0: % (Enabled (Depth-of-field preview button))
Press the camera’s depth-of-field preview button to fire the modeling
flash.
1: & (Enabled (Test firing button))
Press the transmitter’s test flash button to fire the modeling flash.
2: ' (Enabled (with both buttons))
Press the camera’s depth-of-field preview button or the transmitter’s test
flash button to fire the modeling flash.
3: OFF (Disabled)
Disables the modeling flash.
C.Fn-03: ( (FEB auto cancel)
You can set whether or not to cancel FEB automatically after shooting three
shots with FEB.
0: ON (Enabled)
1: OFF (Disabled)
C.Fn-04: ) (FEB sequence)
You can change the order of the FEB sequence, 0: Standard exposure, –:
Decreased exposure (darker) and +: Increased exposure (brighter).
0: 0  –  +
1: –  0  +
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