Sigma 120-300mm f/2.8 DG OS HS M | S £2,700/$3,600

A whopper in terms reach, as well as size

Compared with all of the 70-200mm f/2.8 lenses on test, this Sigma uniquely maintains a fast and constant f/2.8 aperture rating while stretching the zoom range to 120-300mm. That equates to an impressive 50 per cent extra focal length at full stretch. It comes at a price though: not only is this Sigma the most expensive lens on test, but it’s also relatively large, at 121x291mm, and has a filter thread of 105mm.

Typical refinements include ring-type ultrasonic autofocus and dual-mode static/panning optical stabilization – well worth engaging even when using a much-needed monopod. Two FLD and one SLD elements are included and, unlike most Sigma lenses, it features weather seals.

Performance

As one of Sigma’s Sport-line lenses, it’s designed for action photography and, as such, the autofocus system is very fast and efficient. Sharpness and contrast are superb, even at the widest aperture, throughout the entire zoom range. All aspects of performance are absolutely excellent.