Few lenses provoke genuine excitement in hardened photo journalists but Sigma's new 18-35mm f/1.8 zoom is a very deserving exception. Not only does it feature a constant aperture across its zoom range but, for the first time ever, that aperture is a staggering f/1.8 from 18mm right through to 35mm.
f/1.8 maximum aperture; Excellent image quality; Full-time MF option; Very good sharpness
Not full-frame coverage; Somewhat weighty; Modest 2x zoom range