Canon EOS 50D Instruction Manual page 100

[s] Selecting the Metering Mode
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The metering mode is the method of measuring the brightness of the
subject. In the Basic Zone modes, evaluative metering is set
automatically.
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1
Press the <OO·WB> button. (06)
Select the metering mode.
• While looking at the LCD panel, turn
the <B> dial.
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100
[$J Evaluative metering
This is an all-around metering mode suited for
portraits and even backlit subjects. The camera
sets the exposure automatically to suit the scene.
[8J Partial metering
Effective when the background is much brighter than
the subject due to backlighting, etc. Partial metering
covers about 9% of the viewfinder area at the center.
[e]
Spot metering
This is for metering a specific part of the subject or
scene. The metering is weighted at the center
covering about 3.8% of the viewfinder area.
[J
Center-weighted average metering
The metering is weighted at the center and then
averaged for the entire scene.