Canon A2000 IS - Manual (Page 85)

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You can change the brightness metering mode to match the shot you want
to take.
Select the metering mode.
● Press the m button, then use the op
buttons to select .
Select a menu item.
● Press the qr buttons to select a menu
item, then press the m button.
You can lock focusing. Once the focus is locked, it remains locked even if
you let go of the shutter button.
Focus.
● Point the camera so that the subject of the
same shooting distance as the subject
you want to take a picture of, is in the AF
frame
Lock the focus.
● Keep the shutter button pressed halfway
and press the q button .
X The focus is locked and displays on
the screen.
Compose the scene and shoot.
● After shooting, press q to cancel AF lock.
Changing the Metering Mode
Evaluative
Suitable for standard shooting conditions, including back lit
shots. Automatically adjusts the exposure so that the
subject is always properly lit for 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) that
appears at the center of the screen.
%
Shooting with AF Lock