Sigma 28-80mm f/3.5-5.6 II Aspherical Lens for Sigma SLR Cameras Helical Focusing system New optical design, and a "flare-cut" aperture, providing even better optical performance Convenient "Depth Scale" is displayed on the lens barrel to help calculate Depth-of-Field 28-80mm Focal length Minimum focusing distance of less than 20 inches