There are a few conditions when the camera’s autofocus system may not function accurately. At these times, you should use the
•A bright light source within the picture such as the sun near your subject, a strong light reflection such as from water or from the windshield of a car;
•A mirror or other strongly reflective surface near the center of the picture;
•Shooting black
•Presence of flames, smoke or gaseous substances;
•Photographing through glass.
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