Sigma's 24-70mm F2.8 Nikon fit lens has been developed in response to the needs of serious photographers asking for hypersonic motor for fast focus response. Also included is the full-time manual over-ride allowing instant control in low-light situations. Whether you're shooting in fast paced situations or low light situations this lens can handle it. Approximately 30% smaller and lighter than its competitors from the major camera manufacturers, it's a dream to handle and carry on your camera all day long. Its price is surprisingly affordable for a top flight professional lens of this caliber. Finally, its outstanding optical formulation makes it a great performer when used for scenic views and landscapes.