Canon EOS-1D Mark IV - Manual (Page 251)

Troubleshooting Guide
A darker exposure was set with exposure
compensation, but the image looks bright.
• Set [.P.C.Fn II -4: Auto Lighting Optimizer] to [3: Disable], If it is set
to [Standard/Low/Strong], the image might still come out bright even
if you set a darker exposure with manual exposure, exposure
compensation, or flash exposure compensation (p.81, 215).
The maximum burst during continuous shooting is lower.
• Set [.n.C.Fn II -2: High ISO speed noise reduction] to one of the
following settings: [Standard/Low/Disable], If it is set to [Strong], the
maximum burst will greatly decrease (p.214).
• If you shoot a subject which has fine detail (field of grass, etc.), the file
size will be larger and the actual maximum burst might be lower than
the number mentioned on page 61.
ISO 100 cannot be set.
• If [.^.C.Fn II -3: Highlight tone priority] Is set to [Enable], the
settable ISO speed range starts from ISO 200. If [Disable] Is set, ISO
100 can be set (p.215).
When I use the <
Av
> mode with flash, the shutter speed becomes slow.
e If you shoot at night when the background is dark, the shutter speed
becomes slow automatically (slow-sync shooting) so that both the
subject and background are properly exposed. If you do not want a
slow shutter speed to be set, set
[.fl.C.Fn I -15: Flash sync, speed in
Av mode] to 1 or 2 (p.212).
The flash does not fire.
• Make sure the flash (or PC sync cord) is securely attached to the
camera.
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