Canon EOS-1D X Mark III Advanced User's Manual page 209

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Flash Custom Function Settings

For details on the Speedlite's Custom Functions, refer to the Instruction Manual of the

Select [Flash C.Fn settings].

Set the desired functions.

With an EX series Speedlite, the Speedlite will always fire at full output if the [Flash

metering mode] Custom Function is set to [TTL flash metering] (autoflash).

The Speedlite's Personal Function (P.Fn) cannot be set or canceled from the

Select the number.

Select an item.

: External Speedlite control] screen. Set it directly on the Speedlite.

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Troubleshooting