Canon EF-S 17-55mm f/2.8 IS USM

Tomeet user demands for a fast EF-S zoom lens, Canon has speciallydesigned a lens with a large aperture of f/2.8 for select Canon DigitalSLR cameras. The large circular aperture produces a shallowdepth-of-field, creating background blur that draws attention to thephotographic subject. The lens construction includes UD and asphericalelements, which deliver impressive image quality throughout the entirezoom range. Image Stabilizer lens groups shift to compensate for cameramovement so that the image appears steady on the image plane, ensuringclear, crisp images, even in dim light. With a Ring-type USM, innerfocusing and new AF algorithms, this lens achieves autofocus quicklyand quietly, and with full-time mechanical manual focusing, manuallyadjusting the focus is possible even in AF mode.

LENS

Focal Length & Maximum Aperture:	17-55mm 1:2.8
Lens Construction:	19 elements in 12 groups
Diagonal Angle of View:	78°30' - 27°50'
Focus Adjustment:	AF with full-time manual
Closest Focusing Distance:	1.15 ft. / 0.35m
Zoom System:	5-group helical zoom (front group moves: 27mm)
Filter Size:	77mm
Max. Diameter x Length, Weight:	3.3 in. x 4.4 in., 22.8 oz. / 83.5mm x 110.6mm, 645g (lens only)