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To meet user demands for a quick EF-S telephoto lens, Canon has specially designed a brand new lens with an over-sized aperture of f/2.8 for choose Canon Digital SLR cameras.* the massive circular aperture produces a shallow depth-of-field,making background blur that pulls attention to the photographic subject. The lens construction includes UD andaspheric components, that deliver spectacular image quality throughout the whole zoom vary. Image Stabilizer lens teamsshift to atone for camera movement so the image seems steady on the image plane, making certain clear, crisp pictures, even in dim light-weight. With a Ring-type USM, inner focusing and new AF algorithms, this lens achieves auto-focus quickly and quietly, and with full-time mechanical manual focusing, manually adjusting the main focus is feasible even in AF mode