Opteka 500-1000mm High Definition Mirror Telephoto Lens for Canon EOS-M M100, M10, M6, M5 and M3 Compact Digital Mirrorless 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, Fantastic for all types of photographic situations 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