Sigma 10-20mm f/3.5 EX DC HSM
A lens with ‘constant’ attraction Lens mount s Canon EF- S, Nikon DX, Pentax K , Sony A , Sigma
Nearly 10 years old, this 10-20mm zoom predates Sigma’s ‘Global Vision’ line-up of Contemporary, Art and Sport lenses. A revamp of the company’s original 10-20mm lens for APS-C cameras, it swaps from a variable to a ‘constant’ aperture rating.
Up-market glass includes two ELD (Extraordinary Low Dispersion) and an SLD (Special Low Dispersion) element. Construction is sturdier than in the Canon and Nikon lenses, and the Sigma features a more conventional ring-type ultrasonic autofocus system. Compared with Sigma’s 8-16mm lens, the more modest maximum viewing width enables a detachable petal-shaped hood and a filter thread.
Centre-sharpness is impressive throughout the zoom range, but corner-sharpness isn’t quite as good as from the Sigma 8-16mm. Barrel distortion at the short end and colour fringing throughout are controlled well.
Digital Camera verdict
This veteran Sigma is a solid performer with high-grade handling and image quality, and its ‘constant’ aperture rating is unmatched by competing lenses at a similar selling price.