Review: This telephoto zoom lens has a large maximum aperture of f/2.8 which remains constant throughout the zoom range and it is optimized for digital SLR cameras. Two pieces of SLD (the special low dispersion) glass in the front lens group and another two in the rear group offer excellent correction of chromatic aberration.
"While we've tested only a few lenses in its focal length/aperture range, we can say that the Sigma 70-200mm f/2.8 competes very strongly against them. It's a well-built, smoothly-operating, sharp, low-distortion lens. At a street price of roughly $800, it's not cheap, but for the price delivers a lot of capability, and good-quality images."
