Canon 200 IS - Manual (Page 87)

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You can change the Metering mode (brightness measuring function) to
match the shooting conditions.
Choose the Metering mode.
● Press the m button and choose , then
press the m button again.
Choose an option.
● Press the op buttons or turn the Â
dial to choose an option, then press the m
button.
X The setting will display on the screen.
Changing the Metering Mode
Evaluative
Suitable for standard shooting conditions, including back
lit shots. Automatically adjusts the exposure to match the
the shooting conditions.
Center Weighted Avg.
Averages the light metered from the entire frame, but
gives greater weight to the center.
Spot
Only meters within the (Spot AE Point frame).
Also, the Spot AE Point frame is linked with the AF frame
when the AF Frame mode is set to [Center].