This telephoto lens is suitable for: Weddings, events, portrait, nature, wildlife, sports and action photography Affordable long range telephoto zoom lens Optical stabilization compensates for camera shake (not available on Sony & Pentax mounts) Carrying case, lens hood, front & rear caps OS - OPTICAL STABILIZER This function utilizes a built-in mechanism that compensates for camera shake. It dramatically expands photographic possibilities by alleviating camera movement when shooting by hand held camera. HSM - QUIET & FAST AUTOFOCUSING This lens uses a motor driven by ultrasonic waves to provide a quiet, high-speed AF. DG - DG FOR DIGITAL Designed to deliver the ultimate in performance on full-frame digital SLRs, Sigma DG lenses also bring out the best in 35mm SLR film cameras and APS-C size DLSRs. APO - APOCHROMATIC Apochromatic lenses are telephoto and telezoom type lenses which use special optical designs and optical materials (SLD or ELD glass) to improve their performance. The result is images which have greater contrast, sharpness and color definition than a comparable non-APO type lens . All Sigma apochromatic lenses are identified by the APO designation in their descriptions. Please see the Lens Chart for this and other specific lens information. The Sigma 150-500mm

is 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 color correction and sharpness throughout the entire zoom range, rear focusing system corrects for fluctuation of aberration due to focusing. It compact size of a mere 10 inches and weight of only 4 pounds for its focal length make it a must have for any camera bag.