Canon MARK IV User Manual (en)

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Custom Function Settings

The Quick Control Dial’s function while the metering is active can be 
changed.
0: Exposure compensation/Aperture
1: AF point selection

You can select the AF point directly with the <5> dial without first 
pressing the <S> button. While metering is active, turning the <5> 
dial will select a horizontal AF point. Automatic selection cannot be 
selected. However, if C.Fn III -12-2 has also been set, automatic 
selection can be selected.
Press the <O> button and turn the <6/5> dial to set the exposure 
compensation or the aperture for manual exposure.

You can turn the <5> dial to change the ISO speed in real-time.

3: AF point selection + O z S

You can select the AF point directly with the <5> dial without first 
pressing the <S> button. While metering is active, turning the <5> 
dial will select a horizontal AF point. Automatic selection cannot be 
selected. However, if C.Fn III -12-2 has also been set, automatic 
selection can be selected.
The functions of the <O> and <S> buttons will be switched between 
them. By holding down the <S> button and turning the <6> dial, you 
can set the exposure compensation or aperture.

4: ISO speed + O z Z

You can turn the <5> dial to change the ISO speed in real-time.
The functions of the <O> and <Z> buttons will be switched between 
them. By holding down the <Z> button and turning the <6> dial, 
you can set the exposure compensation or aperture.

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