Pentax Optio E60 Operating Manual page 37

[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 same picture
• Strongly reflected light or strong backlighting (bright background)
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