Canon IXUS 50 - Manual (Page 96)

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To Release the FE Lock
Press the button.
The FE lock may be released by pressing the zoom lever, MENU
button or
button, or by changing the white balance, ISO speed,
photo effect or the shooting mode, or by turning the LCD monitor off.
Switching between Metering Modes
You can switch between metering modes to shoot.
Evaluative
Appropriate for standard shooting conditions,
including backlit scenes. The camera divides images
into several zones for light 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.
1 Press the button to switch
between metering modes.
The selected metering mode appears on the
LCD monitor.
Shooting Mode