Canon EOS Rebel XTI - Manual (Page 57)

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In the Image Zone modes, all the AF points are active. Generally, the
AF point covering the closest subject will be selected to focus.
Therefore, the camera sometimes may not the focus the subject you
want. With the (Program AE), , , and modes,
you can select one AF point to focus where you want.
1
Press the <S> button. (9)
X The selected AF point is indicated on
the LCD monitor and in the
viewfinder.
When all AF points light up, automatic
AF point selection will be set.
2
Select the AF point.
Press the key to select the AF
point.
While looking at the viewfinder, you
can select the AF point by turning the
<6> dial until the desired AF point
flashes in red.
Pressing <0> toggles the AF point
selection between the center AF point
and automatic AF point selection.
3
Focus the subject.
Aim the selected AF point over the
subject and press the shutter button
halfway to focus.
S Selecting the AF PointN