Canon EOS 5D Mark III Instruction Manual (en)

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 Setting the FlashN
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.