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Message: <blockquote data-quote="Geoffc" data-source="post: 260150" data-attributes="member: 8705">The 18-200 (I had one) is a good lens and produces quite sharp images on a bright day. Unfortunately being a zoom with such range and not being a fast lens it starts to show weakness in poor light. If you want something better you are probably going to lose the versatility and get something in the 17-50 F2.8 range such as the Tamron, Sigma or Nikon options. I haven't used them so can't recommend one over the other. I have used the 18-70 and I don't personally think it's a big enough improvement to answer your problem. If it's it's in a particular use maybe a prime would sort the problem and the various 1.8G lenses all offer great bang for your buck. I won't show this thread to my wife as she won't ever part with her 18-200.</blockquote>