Tamron 28-200mm f/2.8-5.6 Di III RXD Lens for Sony EOffering the unique mixture of an all in one zoom range and a fast design, the 28 200mm f 2. 8 5. 6 Di III RXD from Tamron is a wide to super tele zoom distinguished by its bright f 2. 8 maximum aperture at the wide end of the zoom, along with its sleek and portable design. A series of specialized elements are used to maintain high sharpness and clarity throughout the zoom range. Benefitting the optical design is an RXD stepping motor, which enables