EF-S 17-55mm f/2.8 IS USM

The Canon EF-S 17-55mm f/2.8 IS USM is a standard zoom lens designed for APS-C-format Canon DSLRs, offering a 27.2-88mm equivalent focal length range with a constant f/2.8 maximum aperture. The optical design incorporates two Ultra-Low Dispersion glass elements and three aspherical elements to minimize chromatic and spherical aberrations, while a Super Spectra coating reduces flare and ghosting for improved contrast in bright lighting conditions.

This lens features a three-stop effective Image Stabilizer system to reduce camera shake, enabling handheld shooting in lower light situations and with slower shutter speeds. The ring-type Ultrasonic Motor provides fast, quiet, and accurate autofocus performance with full-time manual focus override, and the rounded seven-blade diaphragm produces a smooth out-of-focus quality for selective focus techniques.