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.Versatile wide-angle to portrait-length zoom is designed for APS-C-format Canon EF-S-mount DSLRs and offers a 27.2-88mm equivalent focal length range.Bright constant f/2.8 maximum aperture affords consistent illumination throughout the zoom range and also affords greater control over depth of field for working with selective focus techniques.Three aspherical elements minimize spherical aberrations and distortions for improved sharpness and accurate rendering. Super Spectra coating has been applied to individual elements to minimize ghosting and flare for greater contrast and color neutrality when working in strong lighting conditions.Two Ultra-Low Dispersion glass elements noticeably reduce color fringing and chromatic aberrations for high clarity and color fidelity.

• Focal Length : 17 - 55mm,Comparable APS-C Focal Length: 27.2 - 88 mm
• Aperture : Maximum: f/2.8,Minimum: f/22
• Camera Mount Type : Canon EF-S
• Angle of View : 78?? 30' - 27?? 50'
• Minimum Focus Distance : 1.15' / 35 cm
• Magnification : 0.17x
• Diaphragm Blades : 7, Rounded
• Image Stabilization : Yes
• Autofocus : Yes
• Package Contents : Canon EF-S 17-55mm f/2.8 IS USM Lens,E-77 II 77mm Lens Cap,Lens Dust Cap E (Rear),Limited 1-Year Warranty