Canon EOS 5D Mark II Instruction Manual page 205

The image is out of focus.
Set the lens focus mode switch to <AF> (p.31).
To prevent camera shake, hold the camera still and press the shutter
button gently (p.34, 35).
If the lens has an Image Stabilizer, set the IS switch to <1>.
The card cannot be used.
If a card error message is displayed, see page 30 or 209.
The maximum burst during continuous shooting is lower.
Set [8C.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.176).
If you shoot a subject which has minute details (field of grass, etc.), the
file size will be larger and the maximum burst will be lower as
mentioned on page 55.
ISO 100 cannot be set.
If [8C.Fn II -3: Highlight tone priority] is set to [Enable], the
settable ISO speed range will be ISO 200 - 6400. When [Disable] is
set, you can set any ISO speed (p.177).
When I use the <f> mode with flash, the shutter speed
becomes slow.
If you shoot night scenes, 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 [8C.Fn I -7: Flash sync. speed in Av mode] to
1 or 2 (p.175).
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Troubleshooting Guide
205