Pentax IQZoom 105 WR Operating Manual page 40

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3 While depressing the shutter release button half*
way, re*aim the camera or recompose the pic¬
ture, then release the shutter.
Note:
•You can release focus lock simply by lifting
your finger from the shutter release button.
The autofocus system is highly precise, but not
perfect. Some subjects may not focus as you wish.
In such a case, use the focus-lock technique on a
subject near the actual one and equidistant from
the lens. The subjects which may fool autofocus
system include:
a) Extremely low-contrast subjects such as a white
wall or blue sky in the autofocus frame.
b) Subjects which don't reflect much light in the
autofocus frame.
c) Subjects which moving too fast.
d) Subjects with horizontal lines or with finely
complex or detailed pattern in the autofocus
frame.
e) Multiple subjects in foreground of the
autofocus frame.
f) Subjects positioned against reflected light or
strong backlight or with extremely bright back¬
ground.
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