B00OU9CHA8 Opteka 500-1000mm f/8 HD Preset Telephoto Lens with Cloth for Nikon D5, D4s, D4, D3x, Df, D810, D800, D750, D610, D500, D7500, D7200, D7100, D5600, D5500, D5300, D5200, D3400, 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