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Sigma 24-70mm f2.8 EX Aspherical DG DF

Review Date: Jul 1, 2005 Recommend? yes | Price paid: $370.00 | Rating: 9 

Pros: f2.8, Solid, Hood, Sharp
No USM focusing, 82mm filters, Slightly stiff zoom at first, Two step AF/MF change

I got this lens a week ago. I really like it. It feels really nice and solid. I have thouroughly tested this lens and it seems to perform well. It is pretty sharp throughout all the aperatures and at times even f2.8 is pretty sharp. Occasionally, the lens isn't quite as sharp when shooting at a particular focal length and focusing distance. Though, some of that could possibly be my fault. Overall though, I think it is pretty sharp.

Focusing speed seems pretty quick for a non-USM lens. The focusing noise is only annoying if you are focusing from far to near or vice versa.

Lens has a nice feel and build quality to it. The 82mm filter size does get expensive for filters. However, the only thing that I anticipate putting in front of the lens is a polarizer, so the extra cost isn't that big of a deal. I have even heard of people putting 77mm filters on this lens with a 1.6 crop body with no vignetting problems.

The zoom ring is a little stiff at first, but after a week of use, it seems to have loosened to acceptable levels.

The only thing that I really dislike about this lens is the two step method to switch between AF and MF. Though I think I will get used to it.

Many 20D users have reported focusing problems with this lens and I think mine may have the same problem. Though it doesn't seem that bad at all. I will probably send it in anyway just to have it calibrated for my camera body so it will work that much better.