Canon EOS 80D (W), Basic Instruction Manual

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88
When shooting a scene having both bright and dark areas, use the
<
G
> (HDR Backlight Control) mode. When you take one picture in this
mode, three continuous shots are taken at different exposures. This
results in one image, with a wide tonal range, that has minimized the
clipped shadows caused by backlighting.

Hold the camera firmly.
While shooting, hold the camera firmly and steadily. In this mode,
three shots are aligned and merged into a single image. However, if
there is significant misalignment in any of the three shots due to
camera shake, they may not align properly in the final image.
G
Shooting Backlit Scenes
Shooting Tips

Compared to other shooting modes, the shooting range will be smaller.

Flash shooting is not possible. In low light, the AF-assist beam may be
emitted (p.113).

See the cautions on page 93.
HDR stands for High Dynamic Range.