Pentax IQZoom 835 IQZoom 835 Manual - Page 25
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HARD-TO-AUTOFOCUS SUBJECTS 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. (see page 22.) The subjects which may fool the 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 are moving too fast. d)Subjects with horizontal lines or with finely complex or detailed patterns in the autofocus frame. e) Multiple subject in foreground of the autofocus frame. f) Subjects positioned against reflected light or strong backlight or with extremely bright back- ground. 21