From the Manufacturer
Sigma's 17-35mm f2.8-4 EX combines a fast f2.8-4 maximum aperture with ultra wide angle zoom lens of 17-35mm. It incorporates aspherical lens elements in the front, as well as rear lens groups, to correct spherical aberration. It also incorporates internal focusing to prevent deterioration of the optical quality at close distances and to eliminate rotation of the front barrel during focusing. A "perfect hood" is provided. The AF drive for Sigma SA and Canon AF SLR cameras is equipped with a silent, responsive and fast Micro Hyper Sonic Motor (H.S.M.). The lens materials used in this new lens are lead and arsenic free ecological glass.
Product Description
A super wide-angle zoom lens with a 104 degrees angle of view, and large aperture. This lens is ideal for Digital SLR Cameras. Includes 4 Year Service Plan (1 year international warranty plus 3 years extended warranty). Item Specifications: Product Description: Sigma EX wide-angle zoom lens - 17 mm - 35 mm Lens System: Wide-angle zoom lens Mounting Type: Canon EF Lens Aperture: F/2.8-4.0 Focal Length: 17 mm - 35 mm Optical Zoom: 2 x Min Focus Range: 10.6 in Focus Adjustment: Automatic, manual Lens Construction: 13 group(s) / 16 element(s) Special Functions: Wide angle, zoom Filter Size: 77 mm Length: 3 in Weight: 19.8 oz