Canon EF Autofocus Lenses Canons reputation for excellence in optics has been well established for years. And with the introduction of EF lenses for the EOS, its only getting better. EF Lenses have the largest diameter mount of any 35mm camera, which not only strengthens the whole system, but permits optical innovations never before possible. L-Series lenses have better sharpness and contrast because Canon uses aspherical elements to eliminate spherical aberrations. In addition, the L-Series telephotos use UD (Ultra-low Dispersion) glass to reduce chromatic aberration resulting in more accurate colors. A built-in Ultrasonic focusing Motor (indicated by USM) provides pro-quality AF speed with split-second accuracy. 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. 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 / 0.35m Zoom System: 5-group helical zoom (front group moves: 27mm) Filter Size: 77mm Max. Diameter x Length, Weight: 3.3 x 4.4, 22.8 oz. / 83.5mm x 110.6mm, 645g (lens only) More details about product EF-S 17-55mm f/2.8 IS USM Lens
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