Pentax Optio Optio S10 Operating Manual page 35

Pressing the shutter release button
Press the shutter release button slowly in two steps. This allows for exact
focusing as well as preventing camera shake.
Basic way of shutter release
1
Press the shutter release button
halfway.
Lightly press the shutter release button until
you feel the click on your finger.
2
Confirm the focus frame on the
LCD monitor turns green.
Hold the shutter release button and wait
until the focus frame turns green. The
camera is in focus.
3
Press the shutter release button
fully.
Press it down slowly until the shutter is
released.
You can press the shutter release button all the way down (single
step) to take a picture if the camera Focus Mode is set to Standard
(Autofocus).
This allows you to release the shutter at the right moment. The
pictures are taken as deep-focus (pan focus) shots.
The camera is in focus.
The picture is taken.
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