Excellent condition Sigma 150-500mm f/5-6.3 optically stabilized lens with Canon mount. I've treated this lens with only the best care over the years, the optics are in mint condition. Always had a UV filter on the main element from day 1, so there's not a scratch on it. Works great, I've taken a lot of good pictures with this lens over the years. For more detailed information, check out https://www.kenrockwell.com/sigma/150-500mm.htm