Canon EF-S 17-55mm f/2.8 IS USM Wide-angle to Standard Zoom Lens for EF-S Mount APS-C Digital SLR / DSLR Cameras

EF-S17-55mm f/2.8 IS USM
This large-aperture EF-S Series standard zoom lens features an optical system consisting of 19 lens elements in 12 groups. Three aspherical lens elements (one glass-molded and two replica surfaces) efficiently compensate for aberration fluctuations over the entire zoom range while enabling a large f/2.8 aperture and high image quality. Two UD lenses also reduce secondary chromatic aberrations to produce high-resolution, high-contrast images without colour aberration bleeding around subject edges. The inner focus and a ring-type USM achieve silent, high-speed autofocusing, while full-time manual focus override offers excellent operability by enabling users to tweak focusing without exiting the autofocusing mode.


Features:
• 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


Specifications:
• Angle of View (Diagonal): 78°30'~27°50'
• Angle of View (Horizontal): 68°40'~23°20'
• Angle of View (Vertical): 48°~15°40'
• Closest Focusing Distance (m, ft): 0.35/1.2
• Construction (Groups Elements): 12-19
• Diameter x Length (mm) (Approx.): 83.5 x 110.6
• Drive System: Ring-type USM
• Filter Size (mm): 77
• Max. Magnification (x): 0.17
• Min. Aperture: 22
• No. of Diaphragm Blades : 7
• Anti-dust and Moisture: Not Supported