Canon EOS Rebel T6i W Instruction Manual page 228

k Shooting Movies
Cautions for Movie Shooting
Do not point the camera toward an intense light source, such as the sun
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or an intense artificial light source. Doing so may damage the image
sensor or the camera's internal components.
If <Q> is set and the ISO speed or aperture changes during movie
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shooting, the white balance may also change.
If you shoot a movie under fluorescent or LED lighting, the movie may
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flicker.
Shooting a few test movies is recommended where you will perform
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zooming during movie shooting. Zooming during movie shooting may
result in recording of changes in exposure or mechanical sound of the
lens, or images may be out of focus.
You cannot magnify the image during movie shooting.
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Be careful not to cover the built-in microphones (p.222) with your finger,
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etc.
General Movie Shooting Cautions are on pages 253-254.
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If necessary, also read the General Live View Shooting Cautions on
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pages 218-219.
Do not hold the camera in the same position for long periods of time.
Even if the camera does not feel too hot, prolonged contact with the same
body part may cause skin redness, blistering or low-temperature contact
burns. Using a tripod is recommended for people with circulation problems
or very sensitive skin, or when using the camera in very hot places.
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