Opteka 500-1000mm f/8 High Definition Telephoto Mirror Lens for Canon EOS 1D, 5D, 6D, 7D, 10D, 20D, 30D, 40D, 50D, 60D, Rebel XT, XTi, XS, XSi, T1i, T2i, T3, T3i and T4i Digital SLR Cameras f/8-16. High-index / low-dispersion optical glass, Fully multi-coated, every element, Anti-reflection coating Designed to maximize day and night shots by providing maximum light and image transmission with minimum distortion Great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject 500mm Mirror Lens, 2x Multiplier, Carrying bag, and lens caps included! Includes Lens Adapter & 10 Year Worldwide Warranty