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Sigma 80-400mm F4.5-5.6 EX OS APO

Review Date: Oct 30, 2006 Recommend? no | Price paid: $925.00 | Rating: 5 

Pros: Sigma build quality (good but heavy); zoom range; price compared with Canon lenses
Autofocus noisy and slow; image stabilization not nearly as good as Canon's; poor performance not worth the price

I bought this for use with my Rebel XT despite some history of compatibility problems between the two. The lens seemed to work just fine with my camera, but I didn't care for the combination at all. The sound of the autofocus was really annoying, I didn't like the softness of the images it produced and I lost some critical shots to "Err 99" messages.

The image stabilization is not nearly as good as Canon's and the lens requires extremely good lighting to turn out good hand-held shots. A faster lens would be much more useful than Sigma's inferior optical stabilization.

After turning out a variety of uniformly soft and quite a lot f blurry images, I've returned the lens in exchange for the Canon EF100-400L. Much better image stabilization makes it worth the extra price--I wish Canon would nix the white body of the "L" lenses though.