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

Focusing

112
You can focus with the following methods.
Autofocus
=
Manual focus
\

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
4
the focus is locked at that position, k (Continuous mode) where the
subject is kept in focus by continuous adjustment while the shutter release
button is pressed halfway, and f (Auto) which automatically switches
between l and k. The default setting is f.
1 Setting the AF Mode (p.115)
1
Set the focus mode lever to =.
The camera automatically focuses on the subject
when the shutter release button is pressed halfway.
Manually adjust the focus.