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.
Specification
Filter Size
67mm
f/Stop Range
2.8-32
Minimum Focus Distance
10.6" (27 cm) [entire zoom range]
Magnification
1:4.5
Angle of View
78 to 31 (APS-C size equivalent)
Groups/Elements
13/16
Length
3.2" (82mm)
Maximum Diameter
2.9" (74mm)
Weight
15.3 oz (434 g)
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