TAMRON 28-75MM F2.8 DI III RXD LENS SONY E MOUNT SAMPLE PHOTOS. Tamron 28-75mm f/2.8 Di III RXD Lens is the #1 best-selling lens at B&H where, nearly a year after its announcement, it remains out of stock. Out of the many hundreds of lenses available, a Tamron lens compatible only with Sony alpha E-mount cameras is,…