Canon Speedlite 600 EX-RT User Manual (en, zh)

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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 <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:
<
 (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)
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