As a baseball player with a decent batting average, some power, a bit of speed and pretty good fielding ability, need Tamron 18-200 lens is not an All-Star any time soon because it does not excel at one thing. But just like $ 500k/year utility infielder, gives this lens a very good all-around value for what it is. Is it comparable to a prime lens at both ends? Heck, no. Is it a good lens to use when you can not carry a wide selection of lenses with you? Absolutely.
I have used this lens on my 20D quite a bit and have only a few minor dissatisfaction: it has a tendency to hunt for AF (especially when you get closer to 200mm) and it is not the quietest lens I've used.
A previous reviewer mentioned that it maxed out around 160 mm. My own analysis shows that the lack of 200mm, but not by large scale, I found it much closer to the 190 th Yet there is no doubt that these zoom lenses with extreme series like this has a built in fudge factor.
Another reviewer described the problems he encountered when using two screw-on filters. There are not many prime numbers that I have used it will avoid vignetting when using two filters. Heck, my 10-22 deal with only one extra thin. When it darkens the picture - yes, you can add two more pieces of glass in a very complex lens elements ... just asking for trouble.
Regarding concerns about the veil at longer focal lengths, I highly recommend that you use a tripod. I noticed exactly the same - the blurring and lack of sharpness - the lengths of 100 mm. Keep the old rule of thumb in mind - if you're shooting handheld, your shutter speed is not slower than the inverse of your focal length. A 200mm lens on a 20D (or Rebel XT for that matter) is an effective 320mm - I would not recommend shooting any slower than 1 / 500 at maximum zoom with this lens - unless you use a tripod. When I mounted it close, I got great shots without blur.
Remember you get what you pay for here: the convenience of a wide angle, normal and moderate telephoto lens in one piece. If you shoot professionally or need for perfect pictures and then make three or four lenses, this would replace the bag. But if you want an easy to use, the right lens, go for this. It is a jack-of-all-trades, ace-of-no kinda business.
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