Opteka 420-800mm f/8.3 HD Telephoto Zoom Lens for Sony E-Mount a9, a7r, a7s, a7, a6500, a6300, a6000, a5100, a5000, a3000, NEX-7, NEX-6, NEX-5T, NEX-5N, NEX-5R and NEX-3N Digital Mirrorless Cameras Newly improved 2017, manual focus, digitally-optimized telephoto zoom lens Super zoom 420-800mm focal length HD, super multicoated glass optics for the sharper images 4 Elements in 2 groups Rotating tripod mount