Canon MARK IV User Manual (en)
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Custom Function Settings
C.Fn III -13 AF point display during focus
0: On
1: Off
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.
After AF starts, the AF point will light only when it achieves focus.
C.Fn III -14 AF point brightness
0: Normal
1: Brighter
1: Brighter
Makes the AF point light up brighter in red.
C.Fn III -15 AF-assist beam firing
Enables or disables the EOS-dedicated Speedlite’s AF-assist beam.
0: Enable
0: Enable
The external Speedlite will emit the AF-assist beam when necessary.
1: Disable
2: IR AF assist beam only
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.
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.
[Disabled] will override this Custom Function’s 0 and 2 settings. The AF-
assist beam will not be emitted.
COP
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