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<blockquote data-quote="Geoffc" data-source="post: 241904" data-attributes="member: 8705">It is common to need to fine tune lenses. I had to send my D800 and 70-200 with TC back to Nikon as it was beyond tuning. I bought the Reiken Focal software to take the subjectivity out of the process. It seems to work quite well. Others use the lens align product.A couple of things to note. Firstly, if you have a zoom and get it spot on at the widest or longest zoom, it will not be tuned at the other end. You ideally need multiple settings for a zoom and Nikon doesn't provide it. I believe Canon does.&nbsp; I tend to choose mid to long on a zoom as the depth of filed reduces with focal length. If it's something like a 70-300 zoom you probably bought it for the long end mainly anyway.Secondly, the lens will be tuned to the camera/subject distance you tested it so try testing at a common distance. This really got me when I started looking at tuning. I would get it perfect a 6' and then it was off at 2'. Some people actually tune various distances noting the fine tune numbers and then input them as they use it. I don't do that.The points above are pronounced at wide apertures as the depth of field is thin, particularly on full frame cameras. You can't do anything about it, it's just useful to know or you'll think you're going mad.</blockquote>

[QUOTE="Geoffc, post: 241904, member: 8705"] It is common to need to fine tune lenses. I had to send my D800 and 70-200 with TC back to Nikon as it was beyond tuning. I bought the Reiken Focal software to take the subjectivity out of the process. It seems to work quite well. Others use the lens align product. A couple of things to note. Firstly, if you have a zoom and get it spot on at the widest or longest zoom, it will not be tuned at the other end. You ideally need multiple settings for a zoom and Nikon doesn't provide it. I believe Canon does. I tend to choose mid to long on a zoom as the depth of filed reduces with focal length. If it's something like a 70-300 zoom you probably bought it for the long end mainly anyway. Secondly, the lens will be tuned to the camera/subject distance you tested it so try testing at a common distance. This really got me when I started looking at tuning. I would get it perfect a 6' and then it was off at 2'. Some people actually tune various distances noting the fine tune numbers and then input them as they use it. I don't do that. The points above are pronounced at wide apertures as the depth of field is thin, particularly on full frame cameras. You can't do anything about it, it's just useful to know or you'll think you're going mad. [/QUOTE]

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