Canon EOS 5D Mark II Instruction Manual page 126

Live View Shooting Cautions for Stills and Movies
Notes About the Live View Image
Under low light, the Live View image might show chrominance noise. In
still photos, chrominance noise is not recorded. However, in movies, it
will be recorded in almost the same way you see it on the LCD monitor.
When you magnify the image, the image sharpness may look more
pronounced than it really is.
Notes About the Shooting Results
When you shoot continuously with Live View function for a long period,
the camera's internal temperature may increase and it can degrade
image quality. Terminate Live View shooting when not shooting images.
Before taking a long exposure or shooting a movie, stop Live View
shooting temporarily and wait several minutes before shooting. This is to
prevent image degradation.
Live View shooting in high temperatures and at high ISO speeds may
cause noise or irregular colors.
If you shoot still photos at a high ISO speed or shoot a movie in low light,
horizontal stripes may become noticeable as noise.
If you take the picture while the image is magnified, the exposure might
not come out as desired. Return to the normal view before taking the
picture. During the magnified view, the shutter speed and aperture will be
displayed in red. Even if you take the picture during magnified view, the
captured image will show the normal view.
Custom Function Notes
Live View shooting will disable certain Custom Function settings (p.173).
If [8C.Fn II -4: Auto Lighting Optimizer] (p.177) is set to anything
other than [3: Disable], the image may look bright even if a decreased
exposure compensation or flash exposure compensation has been set.
Notes about lenses and flash
The focus preset feature on super telephoto lenses cannot be used.
With an external Speedlite, FE lock, modeling flash, and test flash cannot
be used.
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