Opteka 500-1000mm f/8 Mirror Telephoto Lens for Nikon D5, D4s, D4, D3x, Df, D810, D800, D750, D610, D500, D7500, D7200, D7100, D5600, D5500, D5300, D5200, D5100, D3400, D3300 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)