The Tamron SP AF17-50mm f/2.8 XR Di II LD Aspherical [IF] Lens made for the Nikon SLR system incorporates a motor built into the lens itself, which gives it the capability to autofocus with all
Nikon DSLR cameras (including the D40 and D40x). In addition, with the
motor built into the lens, focusing will be quieter and more responsive.
The Tamron SP AF17-50mm f/2.8 XR Di II LD lens is a lightweight,
compact, fast standard zoom lens designed exclusively for digital SLR
cameras. The focal length of this lens is equivalent to approx. 26-78mm
in 35mm format.
This lens offers an f/2.8 maximum aperture throughout the entire
zoom range, to ensure stress-free photographic shots at all focal
lengths and distances. Additionally, a broader photographic expression
through the use of faster shutter speeds as a result of the maximum
aperture offers enhanced photographic pleasure.
Note! Di-II lenses cannot be used
with digital SLR cameras using image sensors that are larger than that
of an APS-C size imager, or with 35mm film SLR cameras.