Canon EOS 1D Mark II N Instruction Manual page 113

Metered Manual Flash Exposure
For closeup flash photography, you can set the flash exposure
manually. With an EX-series Speedlite having a manual flash mode,
follow the procedure below:
1
Set the camera and Speedlite settings.
Set the camera's shooting mode to <
Set the Speedlite to manual flash.
2
Focus the subject.
Focus manually.
3
Aim the center spot metering circle over the subject,
then press the <FEL> button
The Speedlite will fire a preflash and the required flash output
is retained in memory.
In the viewfinder, the exposure level indicator will indicate the
currently-set flash exposure level relative to the standard
exposure index.
4
Set the flash exposure level.
Adjust the Speedlite's manual flash level and the
camera aperture so that the flash exposure level
indicator is aligned with the standard exposure
index.
5
Take the picture.
TTL and A-TTL Autoflash Speedlites
With TTL and A-TTL autoflash Speedlites (EZ-, E-, EG-, ML-, TL-
series) set in the TTL or A-TTL autoflash mode, the flash will be fired
only at full output. If you set the camera's shooting mode to manual
or aperture-priority AE, you can adjust the aperture and fire the flash
at full output. Meanwhile, the Speedlite will remain in the TTL or A-
TTL autoflash mode.
When the 580EX or 550EX is set to C.Fn-03-1, the flash will always
be fired at full output even in the TTL autoflash mode.
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