Tamron 17-50 f/2.8 & Sigma 17-70 consistency of sharp images

Started Dec 2, 2007 | Discussions thread
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Tigad
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Tamron 17-50 f/2.8 & Sigma 17-70 consistency of sharp images
Dec 2, 2007

Hello,

Owners of one of these lenses(or both) please let me know:

if you shoot 100-200 photos in quite similar conditions, how many of them are tack sharp.
In my tests lots of photos were not sharp, despite the fact some were excellent.

It happened even shooting from tripod, so please eliminate the "human factor" from equation.
Maybe it was a bad copy of lens...

My question is: if I manage to get a good copy, I'll have at least 95% of photos sharp? Right now I'm seriously thinking to buy the Canon EF-S 17-55, but would like to have first some answers here regarding the consistency of sharp photos with Tamron 17-50 and Sigma 17-70.

Seeing a lot of pictures taken with these lenses I realize that many people doesn't understand what really means sharp pictures when they declare they are very satisfied with their Tamron or Sigma lens.
Thank you!

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