Opteka 500-1000mm f/8 HD Preset Telephoto Lens for Sony Alpha E-Mount a9, a7r, a7s, a7, a6500, a6300, a6000, a5100, a5000, NEX-7, NEX-6, 5T, 5N, 5R, 3N Digital Mirrorless Cameras HD, super multicoated glass optics with anti-reflection coating for the sharper images Manual focus, digitally-optimized telephoto zoom lens Great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject Gives you the equivalent of looking through a pair of 20x power binoculars 4 Elements in 4 groups