B00OU9DFLI Opteka 500mm f/8 HD Preset Telephoto Lens with Cleaning Cloth for Sony Alpha E-Mount a7r, a7s, a7, a6000, a5100, a5000, NEX-7, NEX-6, NEX-5T, NEX-5N, NEX-5R and NEX-3N Digital Mirrorless Cameras

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HD, super multicoated glass optics with anti-reflection coating for the sharper images
Manual focus, digitally-optimized telephoto zoom lens
Gives you the equivalent of looking through a pair of 10x power binoculars, rotating tripod mounting mount
4 Elements in 4 groups
May be combined with the Opteka 2X Multiplier for 1000mm Zoom (Sold separately – 47st Photo Item Code: B000JSZ41S)