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http://www.tamron.com/news/35mm/1750di2_2006.aspSpecifications
Tamron AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)Focal Length: 17-50mm
Maximum Aperture: F/2.8
Angle of View: 78°45' - 31°11' (APS-C size equivalent)
Lens Construction: 16 elements / 13 groups
MFD: 10.6" (0.27m) (entire zoom range)
Max. Mag Ratio: 1:4.5 (at f=50mm, MFD 0.27m)
Diaphragm Blades: 7 (Circular Apertures)
Filter Size: Ø67mm
Size (Diameter x Length): Ø2.9 in. x 3.2 in.
Weight: 15.3 oz* (434g)
Standard Accessory: Flower-shaped Lens Hood
Compatible Mount: Canon AF, Konica Minolta AF-D, and Nikon AF-D
*specifications based on Nikon mount