Pentax ZX-5N - Manual (Page 55)

HARD-TO-AUTOFOCUS SUBJECTS
The autofocus system is highly precise, but not perfect.
Depending on the brightness, contrast, shape, and size
of your subject, the autofocus system may not operate.
In such a case, use the focus-lock technique (see page
66.) on another subject that is the same distance away,
or set the focus mode switch to [ MF ] and use the
manual focus mode to focus the lens on the subject
with the aid of the matte field in the viewfinder (see
page 50).
Subjects which may fool the autofocus system include;
a) Extremely low-contrast subjects such as a white wall
in the autofocus frame [C ]].
b) Subjects which don't reflect much light in the
autofocus frame [C D].
c) Subjects which are moving too fast.
d) Multiple subjects in the foreground and background
of the autofocus frame [C 3.
e) Subjects positioned against reflected light or strong
backlight or with extremely bright backgrounds. >
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