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Designed to meet consumer demands for a fast EF-S zoom lens, the EF-S 17-55mm offers image quality on par with Canon’s highly regarded L-series lenses. The lens features a large circular aperture that produces a shallow depth of field, creating background blur that draws special attention to the photographic subject. The lens construction, meanwhile, includes UD and aspherical elements that deliver impressive image quality throughout the entire zoom range. And thanks to the Image Stabilizer lens groups–which shift to compensate for camera shake–the image appears crisp and clear on the image plane, eve in dim light. Finally, the lens offers a ring-type ultra-sonic monitor (USM), inner focusing, and new AF algorithms to help achieve autofocus quickly and quietly, along with full-time mechanical manual focusing that makes it possible to manually adjust the focus even in AF mode. Focal length: 17-55mm Maximum aperture: f/2.8 Lens construction: 19 elements in 12 groups Diagonal angle of view: 78 degrees (at 30 feet) to 27 degrees (at 50 feet) Focus adjustment: AF with full-time manual Closest focusing distance: 1.15 feet Zoom system: 5-group helical zoom (front group moves 27mm) Filter size: 77mm Dimensions: 3.3 inches in diameter, 4.4 inches long Weight: 22.8 ounces The EF-S 17-55mm f2.8 IS USM offers image quality on a par with Canon’s highly regarded L-series lenses. It has a large maximum aperture which, combined with higher shutter speeds, can minimize subject motion blur. Shallow depth-of-field separation of a subject from its background is much easier to achieve and the f2.8 maximum aperture allows a bright finder and extremely precise focusing with f2.8 compatible AF sensors. The internal stabilization has a sharpness benefit equivalent to a three-stop faster shutter speed, making this lens outstanding in low-light situations. Smaller and lighter than lenses of similar specifications, the EF-S 17-55 mm f2.8 IS USM lens has a 35mm equivalent focal length of 27
17-55mm wide-angle zoom lens with f/2.8 maximum aperture for Canon DSLR cameras
AD and aspherical elements deliver impressive image quality through entire zoom range
Image Stabilizer lens groups shift to compensate for image shake even in dim lighting
Large circular aperture produces shallow depth of field; ring-type ultra-sonic monitor (USM)
Measures 3.3 inches in diameter and 4.4 inches long; weighs 22.8 ounces

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