Opteka 500-1000mm f/8 HD Preset Telephoto Lens for Canon EOS 80D, 77D, 70D, 60D, 60Da, 50D, 7D, 6D, 5D, 5DS, 1DS, T7i, T7s, T7, T6s, T6i, T6, T5i, T5, T4i, T3i, T3, SL2 and SL1 Digital SLR 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