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"RE: Problem with 18-200 at 18mm"
This could be a large dust spot on the sensor. I would use the auto sensor cleaning and then use a blower on the sensor.Then go out and shoot just the sky at f/22 and see if the spot is gone. If not try the same shot with a different lens.
Dave SummersNikonians Photo Contest DirectorMy Nikonians Gallery | Current Nikonians Contests