10 out of 10 points and recommendedVery sharp, even when wide open, good contrast, nice color, pretty fast AFNo HSM
I have this lens only a few hours... and I am very satisfied with it... Very sharp, even when wide open at 18mm and liitle less at 50mm. I strongly recommend it. I will use this lens for proffesional work. I also have Tamron SP 28-75 f/2.8. It is really sharp too, but less than SIGMA 18-50 dc ex macro.reviewed August 14th, 2008 (purchased for $518)
Regards from Belgrade, SERBIA.