Details: The Sigma 120-300mm f 2. 8 DG OS HSM Lens for Canon is the first lens introduced into the Sports category for Sigma s Global Vision. Designed for full frame cameras but can work with APS-C sized sensors as well, the 120-300 f 2. 8 has a large aperture and versatile focal length, ideal for a wide range of photography. Though placed in the Sports category, the 120-300 f 2. 8 is also great for nature, automotive, wildlife, and everything in between. Equipped with state of the art technology such as a Hyper Sonic Motor (HSM), an Optical Stabilizer (OS) and Inner Focusing and Zooming, the 120-300 f 2. 8 ensures sharp and beautiful images. The HSM allows for a quiet, fast, and accurate autofocusing while the OS compensates for camera shake while shooting by hand. Two FLD glass elements, which have performance equal to fluorite, are incorporated with one SLD element to reduce color aberration at the highest degree. The Sports category offers not only a higher level of customization through the Sigma USB dock , but also has a dust and splash proof design. Features: Sports Lens Line – This lens is the first lens produced as part of Sigma s Sports line, making it ideally-suited for capturing fast-moving action with high precision. Its telephoto-length zoom range and fast maximum aperture make it especially useful for sports photography as well as wildlife, birding, and other fast-paced applications. Also benefitting these shooting scenarios is a wide range of customizable functions availed through the use of the Sigma USB Dock. Optimized Lens Design – Well-suited to outdoor photography, a dust- and splash-proof construction enables use of this lens in adverse conditions. Joint parts, such as the mount, focus and zoom rings, and switches, are sealed to provide this resistance and improve overall durability. Parts of the lens have also been optimally designed for more comfortable use, including textured rings and well-placed switches for more efficient operation. A brass bayonet