Tamron 70-180mm f/2.8 Di III VXD Lens for Sony EProduct Description: Flexible zoom range, fast design, and compact profile, the Tamron 70 180mm f 2. 8 Di III VXD is a unique take on the ubiquitous and popular telephoto zoom. Designed for full frame Sony E mount cameras, this lens spans a useful short telephoto to mid telephoto range and is characterized by its f 2. 8 maximum aperture to suit working in available light conditions and for controlling depth of field. A sophisticated optical design