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Latest Review Posted Sigma 10-20mm F3.5 EX DC HSM
After about 100 photos shot with this lens I can say:

-AF worked very bad, inaccurate, slow, sometimes it did not respond ... After cleaning the contacts seemed to be the same but magically began to respond perfectly, being slower than most of my screw lenses.

-The sharpnes is very good in the center even at 3.5 but the extreme angles are never very sharp, neither at f16 nor at f22 where definition is lost in the whole image.

-The management and construction are very good, not as good as those of the ART range but very good.

-The distortion is very well controlled, I think I like much more in the 17-20 range than the Tamron 17-50 2.8.

-CHROMATIC ABERRATIONS are remarkable and are reduced by closing the diaphragm but they never disappear, although this is common in glasses that are so narrow

Once I read that EX was excellent or excellent and Sigma stayed far away with this goal, I would have called it OK:lol:

EDIT: It seems that the K3II and the 10-20 dialogue each time better, the HSM is rare. It is the second lens that I tested on HSM and the previous lens (Sigma 50-150) I returned it because the focus was a horror, but I like this lens more and more

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