Tamron AF 17-50mm F/2.8 XR Di-II LD SP ZL Aspherical (IF) Zoom Lens with Built In Motor for Nikon Digital SLR

Designed for exclusive use on digital cameras with smaller-size imagers, this Tamron AF 17-50mm f/2.8 Di-II zoom lens is ideal for a host of situations. The fast f/2.8 aperture, for example, provides a natural out-of-focus effect for portrait shots and other intimate moments. The lens's faster shutters speeds--a result of the maximum aperture--also provide a broader photographic expression to enhance your photographic pleasure. As a result, the lens boasts one of the best close-up shooting performances in the class of fast standard zoom lenses, with the f/2.8 maximum aperture extending throughout the entire zoom range to ensure stress-free shots at all focal lengths and distances. Note: The Tamron AF 17-50mm f/2.8 XR Di-II zoom lens is not designed for conventional cameras or digital cameras with image sensors larger than 24mm x 16mm. Specifications Focal length: 17-50mm Maximum aperture: f/2.8 Lens construction: 16 elements in 13 groups Angle of view: 78 degrees @ 45 feet to 31 degrees @ 11 feet Type of zooming: Rotation Diaphragm blades: 7 (circular) Minimum aperture: f/32 Minimum focusing distance: 10.6 inches Macro magnification ratio: 1:4.5 Filter size: 67mm Corresponding mounts: Nikon Built-in motor: Yes Dimensions: 2.9 inches in diameter and 3.2 inches long Weight: 15.2 ounces Warranty: 6 years