Tamron 17-35mm f/2.8-4 DI OSD Lens for Nikon F

Lightweight and versatile, the Nikon F-mount 17-35mm f/2.8-4 DI OSD Lens from Tamroncovers a range of wide-angle focal lengths while maintaining a brightmaximum aperture. The variable aperture of f/2.8-4 provides exceptionalcontrol over depth of field and allows enough light in to excel in manylow-light situations. Housed in the lens, which weighs slightly morethan a pound, are 15 elements in 10 groups that include Tamron'sBroad-Band Anti-Reflection Coating to reduce reflections, ghosting, andflares. The front lens element is coated in fluorine to more easilydispel dirt, dust, moisture, or fingerprints, and be easier to clean.The lens is also sealed against moisture along the barrel. Additionally,the lens's firmware can be kept up to date via Tamron's optional TAP-inconsole.