Canon EOS 5D MARK II Instruction Manual page 56

Movie Shooting Cautions
Recording and image Quality
When you shoot movies at high ISO speeds, noise [horizontal banding,
dots of light, etc.) or irregular colors may appear
If the attached lens has an Image Stabilizer. the Image Stabilizer will
operate at all times even if you do not press the shutter button halfway.
The Image Stabilizer may cause the total movie shooting time or the
number of possible shots to decrease, if you use a tripod or if the Image
Stabilizer is not necessary, you should set the IS switch to <OFF>.
The camera's built-in microphone will also pick up camera operation
noise. If you use a commercially-available external microphone, you can
prevent (or reduce) these noises from being recordec
Autofocusing during movie shooting is not recommended since it might
momentarily throw the focus way off or change the exposure. If the AF
mode has been set to [Quick mode], AF is not possible even if you
press the <AF-ON > button during movie shooting.
If [Screen settings] has been set to [Stills display] or [Exposure
simulation], the start of the movie shooting might momentarily record a
substantial exposure change.
If the card's remaining capacity is not sufficient for movie shooting, the
movie shooting remaining time [p.135)will be displayed in red.
If you use a card having a slow writing speed, a five-level
indicator might appear on the right of the screen dudng movie
shooting. It indicates how much data has not yet been written
to the card (remaining capacity of the internal buffer memory).
The slower the card. the faster the indicator will climb upward.
If the indicator becomes full, movie shooting will stop
automatically. Indicator
If the card has a fast writing speed, the indicator will either not
appear or the level (if displayed) will hardly go upward. First,
shoot a few test movies to see if the card can write fast enough.
During movie shooting, certain Custom Function settings will be disabled
(p.191-192).
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