Canon Speedlite 600EX-RT Mode D'emploi page 102

C: Setting Custom Functions
;
C.Fn-21:
You can change the light distribution (flash coverage) of the Speedlite in
relation to the shooting angle of view when the flash coverage is set to
"Automatic (L)".
0: 8 (Standard)
The optimum flash coverage for the shooting angle of view is set
automatically.
1: 9 (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 flash icon on the LCD panel
changes to < k >.
2: : (Even coverage)
Although the shooting distance is 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 flash icon on the
LCD panel changes to < l >.
<
C.Fn-22:
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:
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)
100
(Light distribution)
(LCD panel illumination)
(Slave flash battery check)