Amazon.com : Opteka 500-1000mm High Definition Mirror Telephoto Lens for Sony E-Mount NEX-7, NEX-6,
The Opteka 500mm mirror lens is incredibly compact and lightweight (Opteka 500mm with 2X Multiplier). Using an advanced reflex design, this is a mirror lens that is ideally suited for wildlife and sports photography. It has a fixed aperture of f8. It come...