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Canon EF-S 17-55mm f/2.8 IS USM review
To meet user demands for a fast EF-S zoom lens, Canon has specially
designed a 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.
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