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<blockquote data-quote="spb_stan" data-source="post: 643914" data-attributes="member: 43545">Just as an experiment, using a detailed well lit object as subject and shoot Live View to see what is lens and what is AF. The center should be pretty good with the 18-140. I was always impressed with the 18-105 that I got with my D90, first digital camera but disliked the 18-200 on the long end. Are there any focal distances that you like on the&nbsp; 18-140?&nbsp;&nbsp; Live View testing in good light is the best way to isolate the problem to which which element...optics, AF and technique...is the source of the problem. If it is the AF, you can pick the most needed FL needed to be sharpest and fine tune AF for that. Zooms do not usually have uniform AF error throughout the focal range so making corrections to the full range is not usually possible. Nikon service centers have the equipment to align a lens that is not tracking and a camera but the fine tuning available to you is really only effective at one focal length.</blockquote>

[QUOTE="spb_stan, post: 643914, member: 43545"] Just as an experiment, using a detailed well lit object as subject and shoot Live View to see what is lens and what is AF. The center should be pretty good with the 18-140. I was always impressed with the 18-105 that I got with my D90, first digital camera but disliked the 18-200 on the long end. Are there any focal distances that you like on the 18-140? Live View testing in good light is the best way to isolate the problem to which which element...optics, AF and technique...is the source of the problem. If it is the AF, you can pick the most needed FL needed to be sharpest and fine tune AF for that. Zooms do not usually have uniform AF error throughout the focal range so making corrections to the full range is not usually possible. Nikon service centers have the equipment to align a lens that is not tracking and a camera but the fine tuning available to you is really only effective at one focal length. [/QUOTE]

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