Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 293)

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General Live View Shooting Cautions
Image Quality
When you shoot at high ISO speeds, noise (such as dots of light and
banding) may become noticeable.
Shooting in high temperatures may cause noise and irregular colors in
the image.
If Live View shooting is used continuously for a prolonged period, the
camera’s internal temperature may rise, and image quality may
deteriorate. Always exit Live View shooting when you are not shooting.
If you shoot a long exposure while the camera’s internal temperature is
high, image quality may deteriorate. Exit Live View shooting and wait a
few minutes before shooting again.
White < s > and Red < E > Internal Temperature Warning Icons
If the camera’s internal temperature increases due to prolonged Live
View shooting or under a high ambient temperature, a white <
s > or red
< E > icon will appear.
The white < s > icon indicates that the image quality of still photos will
deteriorate. It is recommended that you temporarily exit Live View
shooting and allow the camera to cool down before shooting again.
The red < E > icon indicates that the Live View shooting will soon stop
automatically. If this happens, you will not be able to shoot again until the
camera’s internal temperature decreases. Exit the Live View shooting or
turn off the power and let the camera rest for a while.
Using Live View shooting at a high temperature for a prolonged period
will cause the <
s > or < E > icon to appear earlier. When you are not
shooting, always turn off the camera.
If the camera’s internal temperature is high, the quality of images shot
with a high ISO speed or long exposure may deteriorate even before the
white <
s > icon is displayed.
Shooting Results
In magnified view, the shutter speed and aperture will be displayed in
red. If you take the picture in magnified view, the exposure may not come
out as desired. Return to the normal view before taking the picture.
Even if you take the picture in magnified view, the image will be captured
with the image area of the normal view.