Buy from Amazon.com : http://fave.co/1x0hUpQ <br /><br />Sigma 170-500mm f/5-6.3 DG RF APO Aspherical Ultra Telephoto Zoom Lens for Minolta and Sony<br /><br />Product Description : <br />170-500mm ultra-telephoto zoom lens with f5-63 maximum aperture <br />Multi-layer lens coating reduces flare and ghosting for optimal color balance <br />Aspherical lens and 3 special-low-dispersion SLD glass elements <br />Rear focus systems ensure high performance stability and ease of use <br />Measures 36 inches in diameter and 91 inches long weighs 474 ounces
