Sigma 17-50mm f/2.8 EX DC OS HSM FLD Zoom Lens for Nikon or Canon Digital DSLR Camera

Lens Construction - 17 Elements in 13 Groups
Maximum Magnification - 1:5
Angle of View - 72.4-27.9 degrees
Filter Size Diameter - 77mm
Number of blades - 7pcs (Rounded diaphragm)
Lens Hood - Petal-type hood (LH825-03)
Minimum Aperture - F22
Dimensions Diameter - 3.3in.?3.6in./83.5mm?Length 91.8mm
Minimum Focusing Distance - 11in/ 28cm