Canon 1D X - Manual (Page 198)

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3 Setting the Flash
For details on the Speedlite’s Custom Functions, refer to the Speedlite’s
instruction manual.
1
Select [Flash C.Fn settings].
Select [Flash C.Fn settings], then
press <0>.
2
Set the functions.
Turn the <5> dial to select the
number, then press <0>.
Turn the <5> dial to select the menu
option, then press <0>.
Selecting [Clear all Speedlite C.Fn’s] will clear all the Speedlite’s
Custom Function settings (except [C.Fn-00: Distance indicator
display]).
Flash Custom Function Settings
Clearing Flash Custom Function Settings
With an EX-series Speedlite, if the [Flash metering mode] Custom
Function is set to [TTL] (autoflash), the Speedlite will always fire at full
output.
The Speedlite’s Personal Functions (P.Fn) cannot be set or canceled with
the camera’s [External Speedlite control] screen. Set it with the Speedlite.
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