Pentax OPTIO NB1000, Руководство по эксплуатации

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Poor focusing conditions
The camera may not be able to focus under the following conditions. In these
cases, lock the focus on an object the same distance away as the subject (by
pressing and holding the shutter release button halfway), then aim the camera
at your subject and press the shutter release button fully.
• Objects that lack contrast such as a blue sky or white wall
• Dark places or objects, or conditions that prevent light being reflected back
• Horizontal lines or intricate patterns
• Fast moving objects
• When there is an object in the foreground and an object in the background in
the captured area
• Strongly reflected light or strong backlighting (bright background)