Canon 3822B002 Instruction Manual page 225

C.Fn III -13
0: On
1: Off
The AF point will not light in red other than during AF point selection.
2: On (when focus achieved)
During AF, the manually-selected AF point will no longer light faintly.
After AF starts, the AF point will light only when it achieves focus.
C.Fn III -14
0: Normal
1: Brighter
Makes the AF point light up brighter in red.
C.Fn III -15
Enables or disables the EOS-dedicated Speedlite's AF-assist beam.
0: Enable
The external Speedlite will emit the AF-assist beam when necessary.
1: Disable
2: IR AF assist beam only
Among external Speedlites, only those which have an infrared AF-assist
beam will be able to emit the beam. Set this if you do not want the AF
assist to be emitted as small flashes.
The external Speedlite's Custom Function [AF-assist beam firing] set to
[Disabled] will override this Custom Function's 0 and 2 settings. The AF-
assist beam will not be emitted.
AF point display during focus
AF point brightness
AF-assist beam firing
3 Custom Function Settings
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