Opteka 500mm f/8 High Definition Telephoto Mirror Lens for Nikon D5, D4s, D4, D3x, Df, D810, D800, D750, D610, D500, D7500, D7200, D7100, D5600, D5500, D5300, D5200, D3400, Digital SLR Cameras High definition optics produce sharper, more intense pictures Incredibly compact and lightweight, Fully Multi-coated, Manual Focus Soft pouch and three (3) rear mounted, 30.5mm filters, (ND-2X, ND-4X &amp; Skylight) May be combined with the Opteka 2X Multiplier for 1000mm Zoom (Sold separately - 47st Photo Item Code: B000JSZ41S) 10 Year Warranty