snap58 said:The Tamron 28-75 is "a good lens for the money" it is not however sharper than the 24-70L. It is pretty good at the center but has big problems on the corners, even on a crop camera. I have to wonder if people who have the Tamron and post a review on FM have actually ever used a 24-70L?
Still considering the cost difference not a bad lens.
Well some people at FM posted reviews saying they actually switched from the Canon to the Tamron because their Canon wasn't as sharp as they thought it would be, although I'm sure that some people who bought the Canon 24-70 did so because their Tamron wasn't as sharp as the Canon.
And while I didn't see this when I was interested in this lens (it's quite a new site and they didn't have many reviews 6 months ago), here's another group that tested the MTF. Notice that I put up the test of the Canon 24-70 mm against the Tamron 28-75 mm f/2.8 with Nikon mount. They don't have a review for a Tamron with Canon mount yet, but it's likely to be similar.
http://www.photozone.de/8Reviews/lenses/canon_2470_28/index.htm
http://www.photozone.de/8Reviews/lenses/tamron_2875_28_nikon/index.htm
I like the Nikon 18-200 mm, but I don't like how small the aperture is. If I want actual snapshots with little blur in any photo, I'd just use my point and shoot.
I could see myself being like Mike Teezie one day and completely forgetting about the middle range of focal lengths. Oh well, my Sigma is a keeper.