Just purchased this myself; cheapest price I could find for a new one by quite some way.
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.
The advanced 3-stop Image Stabilizer (IS) technology of the EF 70-300mm f/4-5.6 IS USM lens makes it the ideal telephoto zoom when shooting in lowlight and at slow shutter speeds.