Canon EOS 250D Advanced User's Manual page 215

General Live View Shooting Cautions
Image Quality
When you shoot at high ISO speeds, noise (such as dots of light and
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banding) may become noticeable.
Shooting in high temperatures may cause noise and irregular colors in the
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image.
If Live View shooting is used continuously for a prolonged period, the
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camera's internal temperature may rise, and image quality may deteriorate.
Always exit Live View shooting when you are not shooting.
If you shoot a long exposure while the camera's internal temperature is high,
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image quality may deteriorate. Exit Live View shooting and wait a few minutes
before shooting again.
White <s> and Red <E> Internal Temperature Warning Icons
If the camera's internal temperature increases due to prolonged Live View
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shooting or under a high ambient temperature, a white <s> or red <E> icon
will appear.
The white <s> icon indicates that the image quality of still photos will
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deteriorate. It is recommended that you temporarily exit Live View shooting
and allow the camera to cool down before shooting again.
The red <E> icon indicates that the Live View shooting will soon stop
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automatically. If this happens, you will not be able to shoot again until the
camera's internal temperature decreases. Temporarily exit the Live View
shooting or turn off the power and let the camera rest for a while.
Using Live View shooting at a high temperature for a prolonged period will
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cause the <s> or <E> icon to appear earlier. 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
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high ISO speed or long exposure may deteriorate even before the white <s>
icon is displayed.
Shooting Results
If you take the picture in magnified view, the exposure may not come out as
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desired. Return to the normal view before taking the picture. In magnified
view, the shutter speed and aperture will be displayed in red. Even if you take
the picture in magnified view, the image will be captured with the image area
of the normal view.
If you use a TS-E lens (except the TS-E17mm f/4L or TS-E24mm f/3.5L II)
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for shifting or tilting the lens or if you use an extension tube, the standard
exposure may not be obtained, or an irregular exposure may result.
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