Fast f/1.8 Aperture Zoom. While most zoom lens apertures top off at f/2.8, the Sigma 50-100mm bests that by 1 ⅓ stops. This enables stellar low light shooting, and provides full-frame style depth of field on a crop-frame camera.

Telephoto Zoom. With a 35mm-equivalent focal length of 80mm-160mm, this lens covers you across a telephoto range and is great for sports photography and portraiture work.

High Build and Image Quality. As a part of Sigma’s Art lens line, this lens goes through Sigma’s rigorous A1 testing, ensuring high image quality. The 50-100mm f/1.8 features a complex optical design that boasts 21 elements in 15 groups. These include three “F” Low-Dispersion elements, one Special Low-Dispersion element, and one high-refractive, high-dispersion element. This combination delivers great contrast and clarity while reducing chromatic aberrations and color fringing.

Hyper Sonic Motor Autofocus System. Provides fast, smooth, and quiet operation in a wide variety of shooting situations. You can also manually override the autofocus motor at any time by rotating the focusing ring, giving you quick fine-tuning ability.

Dock Compatible. As part of Sigma’s Global Vision series, this lens is compatible with the Sigma USB Dock for Canon EF Lenses (separate rental item), allowing you to adjust certain parameters through the Sigma Optimization Pro software.