I appreciate that , I saw many pics from the Sigma and Tamron 18-200 and I honestly thought they were under rated , maybe worse than L lenses but not as bad as most of people give them credit for .
but after having seen , the Sigma 17-70 and its photos at flcikr, I think this one is sharper and I may get this one .
I originally thought this Sigma was out of my budget so never considered it seriously.
Since I am a Canon user , the 1.5 crop rate does not apply to me and so the 18-200 or 18-55 is actually like 29.2 -324 in film term?
So now , I am interested in 2 walkabout lenses :
1 Sigma 17-70(about 330USD).
2 Canon EF-S 17-85 IS(about 500USD).
I like the Sigma better because its much shaper and contrasty than the Canon , with less distortion , though it lacks USM.
I do not care about the IS , cause 85 or 70mm is not too long to requaire IS , plus I always carry my tripod .
In door , I just use my 50mm lens .
Also, the 17-85 IS has shown me more serious CA problem than the Kit .
If the Tamron or Sigma 18-200 were 17-150 , I would definitely like it more.
For Nikon people it is a good lens covering 28-300 but for Canon 1.6 crop rate cameras , it is a quite strange focal range.
I do not really care about increased length of tele end of that , but care about wider end since I like to shoot street scenes and landscapes , I am not into birds or nature shooting .
I will see what I can get within 500USD , my original budget was 250 though, since I think I need a lens that is sharp enough to shoot some serious landscape and Cambodia street scenes , I will spend more than I have planned originally.
Any way nothing will disappoint me cause I came from Panny digicams(FX07 and FZ7), which I still have .
Thanks for the link and I appreciate tombomba2.
PS. the kit lens is not so bad optically for the price though , its build quality is just terrible , so I just wanna keep it in side of my room.
If I could re-start again , I would buy a D80 and a Nikkor 18-200VR with Nikkor AF50mm F1.4 and something for wide .
But I already bought an XTI , EX220 (flash), 3 lenses , and hoods for those lenses (Canon sells hoods separately).
I wish Canon makes EF-S17-200 IS like the famous Nikon AF-S18-200.
Or just get a Nikon ..I really like the Nikon D80.