Canon 850 IS - Manual (Page 54)

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Adjust the exposure compensation to a positive value to avoid
making the subject too dark when it is backlit or shot against a
bright background. Adjust the exposure compensation to a negative
value to avoid making the subject too bright in night shots or when
shot against a dark background.
To Cancel the Exposure Compensation
Restore the compensation value to [0].
In mode, the exposure shift can be set/canceled (p. 42) .
Adjusting the Exposure Compensation
Shooting Mode
1 FUNC. Menu * (Exposure Compensation).
See Menus and Settings (p. 22)
*Default setting.
Use the or button to adjust
the exposure compensation and
press the FUNC./SET button.