Manufacturers 3 Year Limited USA Warranty card is included in the box. For all repairs, USA warranty card and an authorized USA retailer's sales receipt must be sent together.</br>Silent DC Motor with GMR senor to increase AF Speed.</br>Spherical and Super-low Dispersion glass elements for maximum resolution.</br>Tokina's exclusive One-touch Focus Clutch Mechanism.</br></br>Product Description</br></br>Tokina lens is the first in a new generation of full frame (FX) lenses designed for professional digital SLR cameras. The 16-28 zoom range gives the professional photographer a super-wide angle of view to get close to subject for dramatic effect or to take in entire scenes.</br><br/>http://www.amazon.com/gp/product/B00E3Y4WO4