Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 439)

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3 Custom Function Settings
Av setting without lens C.Fn6
You can set whether the aperture can still be set when no lens is
attached to the camera.
OFF: Disable
ON: Enable
You can set the aperture with the camera even while no lens is
attached. Convenient when you want to set the aperture in
advance when you know which aperture to use.
Multi function lock C.Fn6
When the power switch is set to < R >, it can prevent the < 6 >,
< 5 >, and < 9 > from accidentally changing a setting.
Select the camera control(s) you want to lock with < R >, then
press < 0 > to add a checkmark [ X ]. Then select [ OK ] to register the
setting.
6 Main Dial
The Main Dial and vertical-grip Main Dial will be locked.
5 Quick Control Dial
The Quick Control Dial will be locked.
9 Multi-controller
The Multi-controller and vertical-grip Multi-controller will be locked.
Custom Controls C.Fn6
You can assign often-used functions to camera buttons or dials
according to your preferences. For details, see page 445.
If you try to use any of the locked camera controls, < 3 > will appear in
the viewfinder and on the top LCD panel. Also, [ LOCK ] will appear on
the Quick Control screen (p.67) and Custom Quick Control screen
(p.463).
By default, with the power switch is set to < R >, the < 5 > dial will
be locked.
Even if the [ X ] is added to lock the < 5 > dial, you can still use the
touch pad < h >.