Join Date: Nov 2002
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Posts: 761
Perhaps poor light in auto exposure modes?
I believe the poster ANRKITEC hit the nail on the head. When I got my new D200 a few months ago it exhibited the very same behavior and I thought my camera was malfunctioning. When I pointed the camera elsewhere it worked. Then I realized that it was perventing me from taking photos when the light was not sufficient in some of the auto exposure modes.