4x Digital Zoom Lens - Opteka 500mm / 1000mm High Definition Mirror Telephoto Lens for Nikon D5, D4s, D4, D3x, Df, D810, D800, D750, D610, D500, D7500, D7200, D7100, D5600, D5500, D5300, D3400, & D3300 Digital SLR Cameras