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Tamron 20-40mm f2.7-3.5 AF SP Aspherical

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DESCRIPTION

15 elements in 12 groups
Angle of View: 94°-57°
Minimum Aperture: F/22
Min. Focus in (m) 0.5m
Macro Mag. Ratio 1:10.2
Filter Diameter: ø77
Weight: 525g
Diam x length: ø81.5 x 81mm
LEGEND
AFAuto Focus
ASLAspherical. The lens employs three aspherical elements to reduce distortion and spherical aberrations at all focal lengths.
IFInternal Focusing
SPSuper Performance Series Lens

Reviews
CameraHobby (and compare to Nikkor 17-35)
http://www.camerahobby.com/Review-Tamron20-40mm.htm
by Riccardo Polini
http://xoomer.virgilio.it/ripolini/20-40.htm
by Edwin Leong (CameraHobby.com)
http://camerahobby.com/Review-Tamron20-40mm.htm