Focusing; Using The Autofocus - Pentax K-5 Operating Manual

Focusing

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You can focus with the following methods.
Autofocus
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Manual focus
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Using the Autofocus

You can also choose the autofocus mode from l (Single mode) where
the shutter release button is pressed halfway to focus on the subject and
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the focus is locked at that position, and k (Continuous mode) where
the subject is kept in focus by continuous adjustment while the shutter
release button is pressed halfway. The factory default setting is l.
1
Turn the focus mode lever to l
or A.
The camera automatically focuses on the subject when the
shutter release button is pressed halfway.
Manually adjust the focus.