Canon EOS REBEL T8i Advanced User's Manual page 375

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.
[Time-lapse movie] cannot be set to an option other than [Disable] when the
camera is connected to a computer with the interface cable, or when an HDMI
cable is connected.
Movie Servo AF will not function.
If the shutter speed is 1/30 sec. or slower, the exposure of the movie may not be
displayed properly (may differ from that of the resulting movie).
Do not zoom the lens during time-lapse movie recording. Zooming the lens may
cause the image to be out of focus, the exposure to change, or the lens aberration
correction not to function properly.
When recording a time-lapse movie under a flickering light, noticeable image
flickering, horizontal stripes (noise), or irregular exposures may be recorded.
Images displayed as time-lapse movies are recorded may look different from the
resulting movie (in details such as inconsistent brightness from flickering light
sources, or noise from a high ISO speed).
When recording a time-lapse movie under low light, the image displayed during
shooting may look different from what is actually recorded in the movie. In such
cases, the [ ] icon will blink.
If you move the camera from left to right (panning) or shoot a moving subject during
time-lapse movie recording, the image may look extremely distorted.
During time-lapse movie recording, auto power off will not take effect. Also, you
cannot adjust the shooting function and menu function settings, play back images,
etc.
Sound is not recorded for time-lapse movies.
If the shutter speed exceeds the shooting interval (such as for long exposures), or if
a slow shutter speed is set automatically, the camera may not be able to shoot at
the set interval. Shooting may also be prevented by shooting intervals nearly the
same as the shutter speed.
If the next scheduled shot is not possible, it will be skipped. This may shorten the
recording time of the created time-lapse movie.
If the time it takes to record to the card exceeds the shooting interval due to the
shooting functions set or card performance, some of the shots may not be taken
with the set intervals.
The captured images are not recorded as still photos. Even if you cancel the time-
lapse movie recording after only one shot is taken, it will be recorded as a movie
file.
If you connect the camera to a computer with the interface cable and use EOS
Utility (EOS software), set [ : Time-lapse movie] to [Disable]. If an option other
than [Disable] is selected, the camera cannot communicate with the computer.
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