Sigma 18-50mm F2.8 or Tamron 17-35mm F2.8-4?

[midicity]

http://www.kenrockwell.com/tech/digital-wide-zooms/comparison.htm

Well I hope this page will help you. Do take a look.

This review link that you posted is for the wide angles, not really applicable for another lens by the same company.

I have the sigma 18-50 F2.8. The constant f2.8 is very useful.
At f2.8, very little vignetting, even with a cheap $18 UV Filter. Personally, I don't find the lens soft at f2.8. However, it is impt to remember that at f2.8, the DoF is very shallow, so it's easy to get OOF pics if your focus is just slightly off.

It's the lens that I use most often. No regrets getting this lens.

I haven't tested the Tamron, but for me, think constant f2.8 and the slightly longer range are more important for me.

 

[spartacus.ret]

The sigma is very very sharp from 2.8 onwards.
http://singaporephoto.blogspot.com

not from f/2.8, then from what?
the 18-50mm max aperture is already f/2.8 la

 

[honda]

Some say this lens is sharp from f4 onwards. I think its sharp from 2.8 onwards.

 

[Big Kahuna]

OK...if KRW said Get the Nikon then you better be :lovegrin: