Pentax K-5 II Operating Manual page 110

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You can focus with the following methods.
AF
Autofocus
MF
Manual focus
The camera automatically focuses on the subject when the
shutter release button is pressed halfway.
Manually adjust the focus. (p.116)
Using the Autofocus
You can also choose the autofocus mode from
AF.S
(Single mode) where
~
the shutter release button is pressed halfway to focus on the subject and
en
the focus is locked at that position, and
AF.C
(Continuous mode) where
5
the subject is kept in focus by continuous adjustment while the shutter
~
release button is pressed halfway. The factory default setting is
AF.S.
:::::s
CQ
.,
c:
:::::s
n
~
0
:::::s
tn
1
Set the focus mode switch to
AF.S
or
C.