The Sigma APO 70-200mm F2.8 EX DG OS HSM ($1,259) is a less-expensive professional alternative to similar lenses from Canon, Nikon, and Sony. The stabilized 70-200mm f/2.8 zoom is the go-to lens for many an event shooter, and getting one for under $2,000 is an appealing prospect.
Excellent center sharpness through most of its range; Fixed f/2.8 aperture; Includes tripod collar; Optically stabilized
So-so images at 200mm f/2.8; Distortion at 70mm; Edge performance could be better