The EF 70-300mm f/4-5.6 IS USM telephoto zoom lens has been developed to meet the high-performance standards that today s photographers demand. Improved Image Stabilizer Technology provides up to three stops of shake correction and the Mode 2 option stabilizes images while panning with a moving subject. Compared to the original Canon EF 75-300mm IS zoom lens this telephoto lens has faster autofocus and overall the lens is lighter and has a smaller diameter than the original. The zoom ring can be locked at the 70mm position making this powerful lens easy to transport too.