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Message: <blockquote data-quote="Love Nikon" data-source="post: 483110" data-attributes="member: 38179">I dont think that is so mike ..I dont want people to be disapointed it they go buy say a  150-500 80to 400 and cannot get good focus at the long end. I have not found a lens that did not need some AF fine tune  and you only need to look at DXO sharpness profiles to see that with 18-xxx zooms the IQ at the far end is not good if xxx is over about 150.The lower end Nikons are cheaper for a reason  and no AF fine tune is one of them. Of course if you have a sigma that uses a USB dock then you can fine tune it independent of the camera,Sigmas production of  which probably proves my point.Thanks J-see for a sensible informative answer</blockquote>