Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 294)

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General Live View Shooting Cautions
Live View Image
Under low- or bright-light conditions, the Live View image may not reflect
the brightness of the captured image.
Even if a low ISO speed is set, noise may be noticeable in the displayed
Live View image under low light. However, when you shoot, the image
recorded will have less noise. (The image quality of the Live View image
is different from that of the recorded image.)
If the light source (illumination) within the image changes, the screen
may flicker. If this happens, exit Live View shooting and resume Live
View shooting under the actual light source.
If you point the camera in a different direction, it may throw off the Live
View image’s correct brightness momentarily. Wait until the brightness
level stabilizes before shooting.
If there is a very bright light source in the image, the bright area may
appear black on the LCD monitor. However, the actual captured image
will correctly show the bright area.
In low light, if you set the [ 5 1: LCD brightness ] to a bright setting, noise
or irregular colors may appear in the Live View image. However, the
noise or irregular colors will not be recorded in the captured image.
When you magnify the image, the image sharpness may look more
pronounced than in the actual image.
Custom Functions
During Live View shooting, certain Custom Functions will not work (some
settings become invalid). For details, see page 420.
Lens and Flash
If the attached lens has an Image Stabilizer and you set the Image
Stabilizer (IS) switch to <
1 >, the Image Stabilizer will operate at all
times even if you do not press the shutter button halfway. The Image
Stabilizer consumes battery power and may decrease the number of
possible shots. When the Image Stabilizer is not necessary, such as when
using a tripod, it is recommended that you set the IS switch to <
2 >.
The focus preset function is possible for Live View shooting only when
using a (super) telephoto lens equipped with the focus preset mode
released in and after the second half of 2011.
FE lock, modeling flash, and metered manual flash exposure will not
work if an external Speedlite is used.