Opteka 500-1000mm f/8 HD Mirror Telephoto Lens with Microfiber Cleaning Cloth for Pentax K-1, K-3 II, KP, K-70, K-S2, K-S1, K-500, K-50, K-30, K-7, K-5, K-3, K20D, K100D and K10D Digital SLR Cameras HD, super multicoated glass optics with anti-reflection coating for the sharper images Manual focus, compact, lightweight digitally-optimized telephoto 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 Soft pouch and three (3) rear mounted, 30.5mm filters, (ND-2X, ND-4X & Skylight)