Canon EOS REBEL T8i Advanced User's Manual page 328

In Live View Shooting
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
Frequent shooting over an extended period may cause the camera's internal
temperature to rise and affect image quality. When you are not shooting, always
turn off the camera.
If you shoot a long exposure while the camera's internal temperature is high, image
quality may decline. Stop shooting and wait a few minutes before shooting again.
White [ ] and red [
If the camera's internal temperature rises from extended shooting or use in hot
environments, a white [
The white [ ] icon indicates that the image quality of still photos will decline. Stop
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 shooting will soon end automatically. Shooting will
not be possible again until the camera cools down internally, so stop shooting
temporarily or turn off the camera and let it cool down a while.
Shooting in hot environments over extended periods will cause the white [
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 [
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.
] icons
] or red [ ] icon will appear.
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