Opteka 500mm / 1000mm High Definition Mirror Telephoto Lens for Pentax K-1, K-3 II, KP, K-70, K-S2, K-S1, K-500, K-50, K-30, K-7, K-5, K-3, K20D, K100D and K10D Digital SLR Cameras f/8-16, High-index / low-dispersion optical glass, Fully multi-coated, every element, Anti-reflection coating Incredibly compact and lightweight, Fully Multi-coated, Manual Focus Soft pouch and three (3) rear mounted, 30.5mm filters, (ND-2X, ND-4X & Skylight) 500mm Mirror Lens, 2x Multiplier, Carrying bag, and lens caps included! 10 Year Warranty