Canon 850 IS - Manual (Page 53)

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Metering Methods
Switching between Metering Modes
Shooting Mode
1 FUNC. Menu * (Evaluative).
See Menus and Settings (p. 22)
*Default setting.
Use the or button to select
the metering mode and press the
FUNC./SET button.
Evaluative
Appropriate for standard shooting conditions,
including backlit scenes. The camera divides
images into several zones for metering. It evaluates
complex lighting conditions, such as the position of
the subject, the brightness, the direct light, and the
backlighting, and adjusts the settings to the correct
exposure for the main subject.
Center
Weighted
Average
Averages the light metered from the entire frame,
but gives greater weight to the subject matter at the
center.
Spot
Meters the area within the spot AE point at the
center of the LCD monitor. Use this setting when
you want to set the exposure on the subject in the
center of the monitor.