Canon EOS-1D X Mark III Advanced User's Manual page 859

Cycle between
the set functions
Flash function
settings
Flash firing
Illuminate info in
viewfinder
Network settings
Create folder
No function
(disabled)
Caution
Assigning [Disable] to the <
Note
< >: "AF stop button" on super telephoto lenses equipped with Image
Stabilizer.
The following section describes some examples of Custom Controls settings.
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> button also disables the Smart controller.
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