Canon Speedlite 430EX III-RT - Manual (Page 85)

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C : Setting Custom Functions
C.Fn-21: ; (Light distribution)
You can change the flash light distribution (flash coverage) of the Speedlite
in relation to the shooting angle of view when the flash coverage is set to
<
L > (automatic).
0: j (Standard)
The optimum flash coverage for the shooting angle of view is set
automatically.
1: k (Guide number priority)
Although the periphery of the picture is slightly darker than the 0
setting, this is convenient when you want to give priority to the flash
output. The flash coverage is set automatically to a slightly more
telephoto position than the actual shooting angle of view. The display
changes to <
k >.
2: l (Even coverage)
Although the effective flash shooting distance becomes slightly shorter
than the 0 setting, this is convenient when you want to minimize light
fall off at the periphery of the picture. The flash coverage is set
automatically to a slightly wider position than the actual shooting angle
of view. The display changes to <
l >.
C.Fn-22: < (LCD panel illumination)
When a button or dial is operated, the LCD panel illuminates. You can
change this illumination setting.
0: 12sec (On for 12 sec.)
1: OFF (Disable panel illumination)
2: ON (Illumination always on)
C.Fn-23: ? (Slave flash charge check)
When the slave unit is fully charged during wireless flash shooting, the AF-
assist beam emitter of the slave unit blinks. You can disable this operation.
Set this function on each slave unit.
0: = (AF-assist beam, Q lamp)
1: > ( Q lamp)