Canon EOS 80D - Manual (Page 100)

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Cautions for <F> Handheld Night Scene
 When shooting with flash, if the subject is too close to the camera, the
picture may come out extremely bright (overexposure).
 If you use flash to shoot a night scene with few lights, the shots may not
align correctly. This can result in a blurry picture.
 If you use flash and the human subject is close to the background that is also
illuminated by the flash, the shots may not align correctly. This can result in a
blurry picture. Unnatural shadows and unsuitable colors may also appear.
 External flash coverage:
• When using a Speedlite with automatic flash coverage setting, the zoom
position will be fixed to the wide end, regardless of the lens’s zoom
position.
• When using a Speedlite requiring manual flash coverage setting, set
the flash head to the wide (normal) position.
Cautions for <G> HDR Backlight Control
 Note that the image may not be rendered with a smooth gradation and
may look irregular or have significant noise.
 HDR Backlight Control may not be effective for excessively backlit
scenes or extremely high-contrast scenes.
 When shooting subjects that are sufficiently bright, for example for
normally lit scenes, the image may look unnatural because of the applied
HDR effect.