The latest super-zooms aren't that bad. Check out reviews over at www.photozone.de for more information. And this guy swares by the Sigma 18-200mm OS http://www.pbase.com/lightrules/lenstests
The Tamron 18-250mm is the best optically and is really rather good. However 250mm f/6.3 will need a fair amount of light to get sharp shots. The alternative is the Sigma 18-200mm OS which isn't quite as sharp, if you look at the photozone review, it kind of oscialtes from sharp to soft through the zoom range. However it does have OS and when I tried one out at a shop i was very impressed. Being able to go straight from 18 to 200mm in one turn is quite impressive and i was getting nice sharp images at 200mm 1/60th of a second which i was rather impressed with! The build quality of the sigma is also very good
A good alternative would be canons two new IS lenses, the 18-55mm IS and 55-200mm IS. They are both optically very good. They are also quite cheap, but the build quality is questionable...
p.s. I brought a Tamron 17-50mm F2.8....
The Tamron 18-250mm is the best optically and is really rather good. However 250mm f/6.3 will need a fair amount of light to get sharp shots. The alternative is the Sigma 18-200mm OS which isn't quite as sharp, if you look at the photozone review, it kind of oscialtes from sharp to soft through the zoom range. However it does have OS and when I tried one out at a shop i was very impressed. Being able to go straight from 18 to 200mm in one turn is quite impressive and i was getting nice sharp images at 200mm 1/60th of a second which i was rather impressed with! The build quality of the sigma is also very good

A good alternative would be canons two new IS lenses, the 18-55mm IS and 55-200mm IS. They are both optically very good. They are also quite cheap, but the build quality is questionable...
p.s. I brought a Tamron 17-50mm F2.8....
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