Canon EOS 1D - Manual (Page 121)

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When an EX-series Speedlite (such as the 580EX II, 430EX II, and
270EX) settable by the camera is attached, you can use the camera’s
menu screen to set the Speedlite’s flash function settings and Custom
Functions. First attach the Speedlite to the camera and turn on the
Speedlite.
1
Select [External Speedlite
control].
Under the [2] tab, select [External
Speedlite control], then press <0>.
2
Select [Flash function settings].
Turn the <5> dial to select [Flash
function settings], then press <0>.
3
Set the flash function settings.
Turn the <5> dial to select a flash
function and set it as desired.
The procedure is the same as setting
a menu function.
3 Setting the Flash
Setting Flash Functions
If you press the <B> button in step 3, you can revert the settings to
the default.
With an EX-series Speedlite not settable with the camera, only [Flash
exp. comp], [E-TTL II], and [Flash firing] are settable under [Flash
function settings].
(Certain EX-series Speedlites also enable [Shutter sync.] to be set.)
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