Sigma's 28-300mm F3.5-6.3 MACRO lens covers all the focal lengths from 28mm wide angle to 300mm telephoto with 10.7:1 high zoom ratio as well as macro capability. 28-300mm F3.5-6.3 MACRO packs a lot of performance in a compact package with ultra compact dimensions (Diameter 74mm and Length of 86mm) that make this lens the ultimate traveling companion. It?s the ideal lens all types of photography and optimized for digital SLR cameras.Multi-layer lens coating reduces flare and ghostingSpecial Low Dispersion (SLD) glass elements and Aspherical lenses provide excellent correction for all types of aberrationsMacro photography with a 1:3 ratioInner focusing system keeps the front from rotating allowing you to use polarizing filters and petal-type hoods"Zoom Lock" prevents the lens for creeping and offers protection while being carried