Canon EOS 1D Mark III - Flash Custom Functions

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Flash Photography
Flash Function Settings and Flash Custom Functions
When an EX-series Speedlite (such as the 580EX II) controllable by the
camera is attached, you can use the camera’s menu screen to set the
Speedlite’s flash function settings such as the flash mode, FEB, and 1st
or 2nd curtain sync, and the flash Custom Functions.
Turn on the Speedlite before setting its functions.
For details on which Speedlite settings the camera can set, see the
EX-series Speedlite’s instruction manual.
1
Select [External Speedlite
control].
Under the [6] tab, select [External
Speedlite control], then press <0>.
2
Select either [Flash function
settings] or [Flash C.Fn settings].
Turn the <5> dial to select the menu
item, then press <0>.
3
Set the flash function settings.
Select a flash function and set it as
desired. The procedure is the same
as setting a menu function.
On the flash function settings screen,
the settable items, current settings,
flash mode setting, and flash Custom
Function settings might look different
on your camera.
Flash function settings
Flash C.Fn settings