I just received a Nikon 500mm f4.0 vr lens and the lens is front focusing so had to adjust the af fine tuning on my d3s to +17 to get a sharp image. In the past I have not had to do much af fine tuning on my lens. Is the tolerances for Nikon professional equipment getting looser? Have other people had to often adjust the af fine tune on their cameras to match up with the lens. Is the +17 too much adjustment when the cameras maximum adjustment is -20 to +20? Any experiences or thoughts?
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