Sigma 10-20mm EX DC HSM Lens F4,0-5,6 (77 mm filter thread) for Canon lens mount (Camera)
I bought the lens a year ago for my Canon EOS 60D. Initial tests confirmed other results: at maximum aperture, in particular at 10 mm, very strong compromising sharpness in the corners, which I find downright mushy. After a year in use, it was not on