Canon SD850 IS manual Metering Methods, Spot

Metering		Methods
			Appropriate for standard shooting conditions,
			including backlit scenes. The camera divides
			images into several zones for metering. It evaluates	oo
[]	Evaluative		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		Averages the light metered from the entire frame,
[]	Weighted		but gives greater weight to the subject matter at the
	Average		center.
			Meters the area within the spot AE point at the
[]		Spot	center of the LCD monitor. Use this setting when
			you want to set the exposure on the subject in the

center of the monitor.

The metering method is fixed to [Evaluative] in the Long

Shutter mode (p. 57).

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