Canon EOS-1D X Mark III Advanced User's Manual page 835

C.Fn3
Restrict shooting modes
You can restrict the shooting modes available with the <
Select shooting modes (<
add a checkmark <
Caution
Restricted shooting mode settings are not registered to <
The < > mark cannot be cleared from all eight modes at the same time.
Restrict metering modes
You can restrict the metering modes available with the <
Select metering modes (<
< >. Select [OK] to register the setting.
Caution
The < > mark cannot be cleared from all four modes at the same time.
Metering used in manual exp
You can set the metering mode used in <
: Specified metering mode
The current metering mode is used.
: Evaluative metering
: Partial metering
: Spot metering
: Center-weighted average
Caution
Setting < /
pressing the <
/ / /
>. Select [OK] to register the setting.
/ / /
/ / > will prevent you from selecting the metering mode by
> button in manual exposure shooting.
/ / / /
>), then press <
> shooting mode.
835
> button.
>), then press <
>, < >, or <
> button.
> to add a checkmark
> to
>.