Canon Speedlite Transmitter ST-E3-RT - Manual (Page 60)

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>: Setting Personal Functions
P.Fn-01: @ (LCD panel display contrast)
You can adjust the contrast of the LCD panel
in 5 levels.
P.Fn-03: B (LCD panel illumination color: Master)
Radio transmission wireless flash shooting, linked shooting: You can select
the color of the LCD panel illumination when the transmitter is set as the
master unit.
0: GREEN (Green)
1: ORANGE (Orange)
P.Fn-04: C (LCD panel illumination color: Slave)
Linked shooting: You can select the color of the LCD panel illumination to
be used when the transmitter is set as the slave unit.
0: ORANGE (Orange)
1: GREEN (Green) COP
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