Tamron 28-200mm f/2.8-5.6 Di III RXD for Sony E-MountTamron has distilled all the technical capabilities and know how amassed over the last 28 years in its development of all in one zoom lenses into the creation of this 28 200mm F 2. 8 5. 6 Di III RXD (Model A071), designed exclusively for Sony E mount. The lens has a large maximum aperture of F2. 8 at 28mm wide end, which represents a worlds first* for all in one zoom lenses, and delivers high level performance across the entire zoom range, from the