The Sigma AF 50-100mm f/1.8 DC HSM Art is a robust telephoto lens designed for Nikon F and Canon EF mounts, aimed at professionals engaged in outdoor expedition photography. Weighing 1490 grams and measuring 93.5x170.7 mm, it features a tripod mount, an 82mm filter thread, HSM autofocus drive, and an optical configuration of 21/15. The creative potential of the Sigma AF 50-100mm f/1.8 DC HSM Art is defined by its focal length range of 75-150mm, with a close focusing limit of 0.95 meters and a 9-blade aperture with a maximum value of f/1.8.