Canon Speedlite 600EX-RT - Manual (Page 102)

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C: Setting Custom Functions
C.Fn-21: ; (Light distribution)
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 .
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 .
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 battery 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)
COP
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