Focusing; Using The Autofocus - Pentax K100 D Operating Manual

Focusing

124
You can focus with the following methods.
Autofocus
=
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
the focus is locked at that position, and k (Continuous mode) where
the subject is kept in focus by continuous adjustment while the shutter
5
release button is pressed halfway. (p.127)
1
Set the focus mode lever to
=.
The camera is focused when the shutter release
button is pressed halfway.
Manually adjust the focus.