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

• EF-S-Mount Lens/APS-C Format
• 27.2-88mm (35mm Equivalent)
• Aperture Range: f/2.8 to f/22
• Two UD and Three Aspherical Elements
• Super Spectra Coating
• Ring-Type Ultrasonic Motor AF System
• Optical Image Stabilizer
• Rounded 7-Blade Diaphragm

A tremendously flexible standard zoom for APS-C-format DSLRs, the EF-S 17-55mm f/2.8 IS USM from Canon pairs the 27.2-88mm equivalent focal length range with a bright f/2.8 constant maximum aperture. Benefitting this design is a sophisticated optical layout, which includes both Ultra-Low Dispersion glass and aspherical elements to significantly reduce chromatic and spherical aberrations for improved clarity and sharpness throughout the zoom range. A Super Spectra coating has also been applied to individual elements to suppress flare and ghosting for increased contrast when working in bright environments.