Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 249)

General Live View Shooting Precautions
Caution
Do not point the camera toward an intense light source, such as the sun or an
intense artificial light source. Doing so may damage the image sensor or the
camera's internal components.
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.
Live View shooting over an extended period may cause high internal temperatures
and affect image quality. 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 decline. Exit Live View shooting and wait a few minutes before
shooting again.
White [ ] and red [ ] internal temperature warning icons
White [ ] or red [ ] icons indicate high internal camera temperature, caused by
factors such as extended Live View shooting or Live View shooting in hot
environments.
The white [
] icon indicates that the image quality of still photos will decline. Stop
Live View shooting for a while and allow the camera to cool down.
Shooting at low ISO speeds instead of high speeds is recommended when the
white [
] icon is displayed.
The red [ ] icon indicates that Live View shooting will soon stop automatically.
Shooting will not be possible again until the camera cools down internally, so stop
Live View shooting temporarily or turn off the camera and let it cool down a while.
Live View shooting in hot environments over extended periods will cause the white
[
] or red [ ] icon to appear sooner. 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 decline even before the white [
] icon is
displayed.
Shooting results
In magnified view, the shutter speed and aperture value 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.
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