Nikon Coolpix A100 - Manual (Page 58)

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Subjects Not Suitable for Autofocus
The camera may not focus as expected in the following situations. In rare cases,
the subject may not be in focus despite the fact that the focus area or the focus
indicator is displayed in green:
• Subject is very dark
• Objects of sharply differing brightness are included in the scene (e.g. the sun
behind the subject makes that subject appear very dark)
• No contrast between the subject and surroundings (e.g. a portrait subject
wearing a white shirt is standing in front of a white wall)
• Several objects are at different distances from the camera (e.g. the subject is
inside a cage)
• Subjects with repeating patterns (window blinds, buildings with multiple
rows of similarly shaped windows, etc.)
• Subject is moving rapidly
In the situations noted above, try pressing the shutter-release button halfway
to refocus several times, or focus on another subject positioned at the same
distance from the camera as the actual desired subject, and use focus lock
(
A43).