Pentax *ist IST DS - Manual (Page 120)

118
5
F
uncti
on Re
ferenc
e
Focusing
You can focus with the following methods.
Select the area in the viewfinder to focus (focus point) from [Auto], [Select]
and [Center]. (p.123)
1
Set the focus mode lever to
=.
2
Look through the viewfinder
and press the shutter release
button halfway.
=
Autofocus
The camera is focused when the shutter release
button is pressed halfway. Focus is locked on
the area shown when shutter release button is
pressed halfway.
\
Manual focus Manually adjust the focus.
Using the Autofocus