Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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3
 Setting the Flash FunctionN
1
Select [Clear settings].
2
Select the settings to be cleared.
 
Select [Clear flash settings] or 
[Clear all Speedlite C.Fn’s], then 
press <0>.
 
On the confirmation dialog, select 
[OK]. Then the flash settings or 
Custom Function settings will all be 
cleared.
Clearing Flash Function Settings / Flash C.Fn Settings
The Speedlite’s Personal Function (P.Fn) cannot be set or canceled on the 
camera’s [External Speedlite control] screen. Set it directly on the 
Speedlite.