This past month, I was lucky enough to visit two amazing birding hotspots with the Sigma 120-400mm F4.5-5.6. Now, after shooting with this compact, long-reach tele zoom, I’ve got to say that is has quickly become one of my favorite lenses in the Sigma lineup for its fantastic combination of reach, range and amazing sharpness in a very compact package–under four pounds and just eight inches long.