Tamron 17-28mm f2.8 Di III RXD - Sony-FE Mount (5433) The Tamron 17-28mm F/2.8 Di III RXD (Model A046) lens is designed for Sony full-frame mirrorless cameras and achieves all of the benefits of a fast F/2.8 aperture in an ultra-wide-angle zoom lens. It has an amazingly compact and lightweight design weighing just 420g and having an overall length of just 99mm. The compact size provides excellent balance and is easy to carry especially with no barrel extension whilst focusing or zooming making it great for travelling.The 17-28mm RXD offers a large F/2.8 aperture throughout the entire zoom range and delivers edge-to-edge high-resolution and contrast. The combination of ultra-wide-angle focal length large constant F/2.8 aperture and a Minimum Object Distance (MOD) of 19cm (at the wide-angle end) encourages richly expressive and creative photography in a multitude of scenarios.The 17-28mm zooms AF drive system is powered by the RXD (Rapid eXtra-silent stepping Drive) AF motor unit that enables it to deliver high-speed high-precision and superbly quiet operation making it suitable for shooting virtually noise-free video as well as still photographs. In addition moisture-resistant construction and a hydrophobic fluorine coating repels fingerprints and dirt. The 17-28mm RXD is also fully compatible with various camera-specific features including Fast Hybrid AF and Eye AF. High performance optical construction and design combined with exceptional portability make the 17-28mm zoom the ideal fit for your mirrorless camera body and ideal for professional or enthusiast use.