I am using the D7000 with a Sigma 18-200For some reason the autofocus won't lock at all. When I push the trigger button down slightly it the focus moves back and forth never finding the right point.I switched the lens to my D90 and there is no problem so I assume it is not the lens.Also the assist light does not come on and it looks like in the menu that it is set for it to come on.I am about to bring it to a repair shop and thought I would post here first.BF
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