Introduction Sigma is the largest independent lens maker in the world and produces a number of specialist lenses outside of those normally found in the ranges offered by the camera marques. This lens is one of those models.As a full-frame lens it’s a tempting addition for anyone looking to capture elusive nature and wildlife and may even be a useful addition for sports and action. This lens is particularly attractive, however, when used on an APS-C body, where it has the equivalent field of view of a stabilized 75-750 mm.As usual with Sigma, it has a