For years, I was a lazy photographer. My first few lenses, starting with the compact 18-55mm kit lens on my Canon EOS 500D and eventually upgrading to the 24-105mm and 70-200mm zooms, gave me ...

A versatile, professional-grade lens with superior light-gathering capability, though there's a compromise to be made in terms of weight. Chromatic aberration and coma are significantly corrected. Why ...