Pentax ZX-5N - Manual (Page 32)

(3) USING THE 3-POINT AF MODE
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This camera incorporates 3-point autofocus system.
The subject will be focused properly even if the main
subject is slightly off the center of the AF frame.
c Set the AF mode switch to C 3'.
• The Spot AF Mode is also available in this camera.
See page 65 for details.