Opteka 500mm f/6.3 (with 2X- 1000mm) Telephoto Mirror Lens for Sony a9, a7R, a7S, a7, a6500, a6300, a6000, a5100, a5000, a3000, NEX-7, NEX-6, NEX-5T, NEX-5N, 5R, 3N and Other E-Mount Digital Cameras