The EF 70-300 f4-5.6 IS USM telephotozoom lens has been developed to meet the high-performance standards thattoday\'s photographers demand. Improved Image Stabilizer Technology provides upto three stops of "shake" correction, and the "Mode 2"option stabilizes images while panning with a moving subject. Compared to theoriginal Canon EF 75-300mm IS zoom lens, this telephoto lens has fasterautofocus, and overall the lens is lighter and has a smaller diameter than theoriginal. The zoom ring can be locked at the 70mm position, making thispowerful lens easy to transport, too.