Canon EF-S 17-55mm f2.8 IS USM Lens

Description

To meet user demands for a fast EF-S zoom lens, Canon has specially designed a new lens with a large aperture of f/2.8 for select Canon Digital SLR cameras.* The large circular aperture produces a shallow depth-of-field, creating background blur that draws attention to the photographic subject. The lens construction includes UD and aspherical
elements, which deliver impressive image quality throughout the entire
zoom range. Image Stabilizer lens groups shift to compensate for camera movement so that the image appears steady on the image plane, ensuring clear, crisp images, even in dim light. With a Ring-type USM, inner
focusing and new AF algorithms, this lens achieves autofocus quickly and
quietly, and with full-time mechanical manual focusing, manually
adjusting the focus is possible even in AF mode.