Focus Lock - Pentax w Operating Manual

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2
Press the shutter release
button halfway.
Only the center is focused where the
focus point is superimposed.
Set the focus point select dial to 5 to cancel the selected focus point and return
to automatic setting.

Focus lock

4
If the subject is beyond the range of the focus points area, the camera
cannot automatically focus on the subject. In this situation, you can aim the
focus point on the subject, use focus lock, then recompose the picture.
You can take pictures in Focus lock mode when the focus mode is set to
l (Single Mode).
1
Frame the desired composition
for your picture in the
viewfinder.
You can use focus lock when the
subject you wish to focus on is not
within the focus point area.
2
Aim the center of the
viewfinder over the subject,
then press the shutter release
button halfway down.
The focus indicator []] lights up and you
will hear a beep when the subject comes
into focus. (If it is blinking, the subject is
out of focus.)
(Example)
The person is out of focus
and the background is
focused instead.