Professional 16-28mm F/2.8 LensDesigned for professional full frame (FX) Nikon DSLRs.NEW Silent DC Motor With GMR SensorThe 16-28 f/2.8 uses a newly developed silent DC motor that allows the lens to focus faster and more quietly then previous generations. The DC motor coupled with a new GMR magnetic AF sensor work together to increase AF Speed.Aspherical and Super-Low Dispersion Glass ElementsA new, 56mm-diameter, large size aspherical glass element is incorporated into the front lens group, while there are 2 more aspherical elements in the rear group. 3 SD super-low dispersion glass elements are also incorporated throughout the optical design to reduce chromatic aberration, give maximum resolution, more even brightness and distortion correction.One-Touch Focus ClutchTokina's exclusive One-touch Focus Clutch Mechanism allows the photographer to switch between AF and MF simply by snapping the focus ring forward for AF and back toward the camera to focus manually. There is no second AF/MF switch on the lens for Nikon, everything is accomplished by the focus ring.

Performance

Focal Length	16 - 28 mm
Aperture	Maximum: f/2.8 Minimum: f/22
Camera Mount	Nikon F
Format Compatibility	Nikon FX/35mm Film Nikon DX
Angle of View	107° - 76°
Minimum Focus Distance	11" (27.94 cm)
Maximum Reproduction Ratio	01:05.3
Elements/Groups	13/15
Diaphragm Blades	Not Specified By Manufacturer

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Features

Image stabilization	No
Autofocus	Yes

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Physical

Dimensions	Approx. 3.54 x 5.25" (8.99 x 13.34 cm)
Weight	2.09 lb (950 g)

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