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17-55 mm f/2.8 EF-S IS USM Wide Angle Zoom Lens | |
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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.(EOS 30D, 20D, 20Da, Digital Rebel XT and Digital Rebel only) 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.Canon strengthens its EF-S lens series with the Image Stabilized wide angle EF-S 17-55mm f/2.8 IS USM. With image quality and construction approaching that of Canon's renowned professional lenses, the EF-S 17-55mm f/2.8 IS USM becomes the fastest standard focal length zoom for EF-S mount cameras such as the new EOS 30D. Combining constant f/2.8 aperture throughout the zoom range with Canon's latest 3-stop Image Stabilizer, it delivers outstanding wide angle performance and framing flexibility in low light conditions. Specialist optics such as UD glass and aspherical elements help deliver exceptional clarity, sharpness, contrast and colour accuracy.EF-S mount - The lens fits exclusively on those EOS cameras with an EF-S lens mount - the new EOS 30D, the EOS 20D and Rebel models. The 1.6x multiplication effect of these cameras' APS-C size sensor gives the lens an effective focal length of approximately 27-88mm.Image quality - To improve image clarity over the total image area, two Ultra-Low Dispersion glass (UD) elements are employed to eliminate secondary chromatic aberrations that otherwise reduce sharpness and introduce colour fringing. To ensure crisp, high contrast from one corner of the frame to the other, two aspherical lens elements have been introduced to avoid spherical aberrations that can soften images, especially at wider apertures. In combination with digital EOS CMOS sensor and DIGIC II image processor technologies, the EF-S 17-55mm f/2.8 IS USM delivers image quality surpassing that required for many commercial applications.Fixed f/2.8 from 17 - 55mm - Superb optical quality with no change in aperture over the full focal length range allows photographers to set exposure at the widest aperture and concentrate on framing, without concern for adjusting shutter speed at longer focal lengths. The lens employs an almost perfectly circular barrel aperture, helping create attractive, even background blur.Image Stabilizer - The lens features Canon's latest 3-stop Image Stabilizer (IS) for dramatically reduced image blur caused by camera shake. IS significantly extends scope for shootin
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Name : 17-55 mm f/2.8 EF-S IS USM Wide Angle Zoom Lens |
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