B00OU9CKLO Opteka 500-1000mm f/8 Preset Telephoto Lens with Cleaning Cloth for Sony Alpha A99, A77, A65, A58, A57, A55, A37, A35, A33, A900, A700, A580, A560, A550, A390, A380, A330 and A290 Digital SLR 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
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