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Construction:13 Groups/ 16 Elements Diaphragm: 7 bladesAngle of view:78 at 45 - 31 at 11 (APS-C size equivalent)F stop range:2.8- 32Closest Focusing Distance:10.6in. (0.27m)Maximum Magnification:1:4.5 Maximum Aperature: f/2.8-4Filter Size:67mmDimensions (Length x Diameter):L: 81.7 x D 74.0 mm / 3.2 x 2.9Weight:14oz. (398g) appx.Di II: Lenses are designed for exclusive use on digital cameras with smaller-size imagers and inherit all of the benefits of our Di products. These lenses are not designed for 35mm film cameras and digital cameras with image sensors larger than 24mm x 16mm. The SP AF17-50mm f/2.8 is a lightweight compact fast standard zoom lens designed exclusively for digital SLR cameras expanding the product concept of the popular SP AF28-75mm f/2.8 zoom lens. In addition portrait shots are made beautiful with the natural out-of-focus effect characteristic provided by the fast f/2.8 aperture. Additionally a broader photographic expression through the use of faster shutter speeds as a result of the maximum aperture offers enhanced photographic pleasure. The lens boasts one of the best close-up shooting performances in the class of fast standard zoom lenses designed exclusively for digital cameras and featuring an f/2.8 maximum aperture throughout the entire zoom range to ensure stress-free photographic shots at all focal lengths and distances.