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If it was dark, the camera may not have locked on in a particular AF mode. Even the D2x does it sometimes in dingy conditions with plain subjects (walls etc with little detail). I have to use the manual override on the lens in those cases.
The camera's default stting is to disable release in certain AF modes if the camera doesn't lock focus. Focus-Priority. In other dynamic AF modes, the camera defaults to release-priority, whether the focus is locked on or not.
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