I bought it instead of Sigma 10-20/4.5-5.6 with good discount price. For such price very good wide zoom lens for crop cameras. When buy try to check a few copied due bad Sigma quality control. My copy is really perfect. For higher price check Tokina 11-16/2.8, but for me zoom range is not enough
Fast and accurate focus; Sharp in center even open at 3.5 at 10 mm; Very reasonable sharpness in corners after 7.1; Overall picture quality better compared to Sigma 10-20/4.5-5.6 and Sony 11-18/4.5-5.6
Some CA at 3.5 in corners; No after 4.5; Could be less distortion in corners at 10-12 mm