Overview

The Sigma 120-300mm F2.8 EX DG OS HSM delivers excellent center sharpness even wide open, rivaling prime lenses. However, it exhibits focus breathing, reducing effective focal length at close distances. Build quality is solid with a rubberized coating, but the plastic lens hood disappoints for its price. Handling is criticized for poor weight distribution and balance, especially on Nikon bodies. It suits photographers needing a fast f/2.8 zoom beyond 200mm, but the predecessor offers similar optics at lower cost.