Overview

The Sigma 800mm F5.6 EX DG HSM is an extremely large, heavy lens (over 11 lbs) built like a 'tank cannon'. Optically, it delivers very sharp images even with teleconverters and at long distances, resolving fine details like a stadium 15 miles away. Weaknesses include significant weight and bulk, making travel and tripod mounting cumbersome. It suits dedicated wildlife and bird photographers willing to manage its size for exceptional reach and image quality.