Digitalmate 500mm f/8 HD Reflex Mirror Telephoto Lens for Nikon D4S, D4, D3X, D810, D800, D750, D700, D610, D600, D300, D90, D7200, D7100, D5500, D5300, D5200, D5100, D3300, D3200 Digital SLR Camera HD, super multicoated glass optics with anti-reflection coating Manual focus, compact, lightweight digitally-optimized with advanced reflex design 7 Elements in 6 groups Soft pouch and three (3) rear mounted, 30.5mm filters, (ND-2X, ND-4X & Skylight) May be combined with the Digitalmate 2x multiplier for 1000mm (sold separately)