The Sigma 150-500mm f/5-6.3 is an ultra telephoto zoom designed for Full Frame sensors but may also be used with smaller APS-c size sensors with a corresponding effective increase in focal length to about 255mm to 850mm on the Sigma SD format. An Optical Stabilizer (OS) allows for handheld photography even in low light scenarios, while a Hyper Sonic Motor (HSM) ensures quiet, high speed, and accurate autofocusing. This unique lens is an excellent optical performer featuring three SLD (Special Low Dispersion) glass elements for optimum colour correction and sharpness throughout the entire zoom range, rear focusing system corrects for fluctuation of aberration due to focusing. It’s compact size of 25.4cm and weight of only 18Kg, make it a must have for any camera bag. Almost brand new condition due to having very little use. Fitted with Marumi 86mm optical protection filter. Comes with the original case. Manual not included. This lens has a Canon EF compatible mount.