Fixing The Focus (Focus Lock) - Pentax K 100D Super Operating Manual

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Fixing the Focus (Focus Lock)

If the subject is outside the range of the focusing area, the camera cannot
automatically focus on the subject. In this situation, you can aim the
focusing area toward the subject, use focus lock and recompose the
picture.
1
Frame the desired composition
for your picture in the
viewfinder.
Use focus lock function when the
subject you wish to focus on is not
inside the focusing area.
5
2
Center the subject to focus in
the viewfinder and press the
shutter release button halfway.
The focus indicator ] appears and
you will hear a beep when the subject
comes into focus (if it is blinking, the
subject is not in focus).
3
Lock the focus.
Keep the shutter release button pressed halfway. The focus will remain
locked.
(Example)
The person is out of focus
and the background is
focused instead.