The Sigma 24-105mm f/4 DG OS HSM Lens for Canon DSLR Cameras is a premium lens designed for full frame cameras and will also work with APS-C sensors with an effective increase in focal length. The 24-105mm f/4 is a highly versatile focal range and staple everyday lens. With the increasing resolution power of new sensors, it is designed to bring out the true potential of evolving camera technology. Sigma's 24-105mm f/4 includes proprietary Sigma technology including our Hyper Sonic Motor (HSM) which ensures fast, quiet and accurate autofocusing as well as our Optical Stabilizer (OS) which compensates for camera shake. A 9 blade rounded diaphragm creates beautiful background blur, while FLD and SLD glass elements compensate for various aberrations, distortion and curvature. The use of Thermally Composite Material (TSC) reduces size and weight and as part of the new Global Vision design, it is compatible with the Sigma USB dock for further customization and the new Mount Conversion Service.Features: For Full Frame and Crop Sensor Cameras 3 Aspherical, 2 SLD, and 2 FLD Elements Optical Stabilizer Thermally Stable Composite Internal Focusing System Hyper Sonic AF Motor Compatible with Sigma USB Dock