Opteka 500mm f/6.3 HD Telephoto Mirror Lens for Nikon D5, D4s, D4, D3x, Df, D810, D800, D750, D610, D500, D7500, D7200, D7100, D5600, D5500, D5300, D5200, D3400, D3300 Digital SLR Cameras High-index / low-dispersion optical glass, fully multi-coated, every element, anti-reflection coating 7 elements in 6 groups Incredibly compact and lightweight Great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject May be combined with the Opteka 2x multiplier for 1000mm (Sold separately - 47st Photo Item Code: B000JSZ41S)