Canon EOS 4000D Instruction Manual page 159

General Movie Shooting Cautions are on pages 179-180.
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If necessary, also read General Live View Shooting Cautions on
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pages 155-156.
The ISO speed (ISO 100 - ISO 6400), shutter speed, and aperture are
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set automatically.
You can press the <A> button (p.118) to lock the exposure (AE lock).
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The exposure setting will be displayed for the number of seconds set
with [k2: Metering timer]. After applying AE lock during movie
shooting, you can cancel it by pressing the <S> button. (AE lock setting
is retained until you press the <S> button.)
By holding down the <O> button and turning the <6> dial, you can
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set the exposure compensation. Due to the LCD monitor's
characteristics, the brightness may look different depending on the angle
at which you look at the LCD monitor. Therefore, when setting the
exposure compensation, it is recommended that you take test shots and
check the exposure with the histogram (p.232).
If you shoot a movie with autoexposure, the ISO speed, shutter speed,
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and aperture will not be recorded in the movie's Exif information.
With autoexposure movie shooting, the camera will automatically turn on
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the Speedlite's LED light under low-light conditions. For details, refer to
the Instruction Manual of the EX-series Speedlite equipped with an LED
light.
k Shooting Movies
159