Canon EF-S 17-55mm f/28 IS USM Lens

A tremendously flexible standard zoom for APS-C-format DSLRs - the EF-S 17-55mm f/28 IS USM from Canon pairs the 272-88mm equivalent focal length range with a bright f/28 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 Beyond the optical attributes - this 17-55mm is also characterized by its advanced three stop-effective Image Stabilizer system to minimize the appearance of camera shake Also complementing handling is a sophisticated ring-type USM - which provides quick - quiet - and accurate autofocus performance along with full-time manual focus override

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

Focal Length: 17 to 55mm (35mm Equivalent: 27.2 to 88mm)

Maximum Aperture: f/2.8

Minimum Aperture: f/22

Lens Mount: Canon EF-S

Lens Format Coverage: APS-C

Angle of View: 78° 30' to 27° 50'

Minimum Focus Distance: 1.15' / 35 cm

Maximum Magnification: 0.17x

Optical Design: 19 Elements in 12 Groups

Diaphragm Blades: 7 - Rounded

Focus Type: Autofocus

Image Stabilization: Yes

Filter Size: 77 mm (Front)

Dimensions (ø x L): 3.29 x 4.35-inch / 83.5 x 110.6 mm

Length at Maximum Extension: 5.55-inch / 141 mm

Weight: 1.42 lb / 645 g