Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 373)

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Electronic full-time MF
Operation of manual focus adjustment using the electronic focusing ring when certain lenses
are attached is customizable. Check the Canon website for compatible lenses.
Disable
Operation of manual focus adjustment corresponds to the [ Lens electronic MF ] setting.
Enable
Manual focus adjustment is available whenever the camera is on.
Lens electronic MF
For EF lenses equipped with electronic manual focusing, you can specify how manual focus
adjustment is used with One-Shot AF.
[ ] Disable after One-Shot
After the AF operation, manual focusing adjustment is disabled.
[ ] One-Shot→enabled
You can manually adjust the focus after the AF operation if you keep holding down the
shutter button halfway.
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