EF 300mm f/4.0L IS USM
Compact L-series telephoto lens with an Image Stabilizer that compensates for camera shake with the equivalent effect of a shutter speed two stops faster. Two Image Stabilizer modes are provided: Stabilizer Mode 1 (the same mode featured on the EF 75-300mm f/4-5.6 IS USM) and the new Stabilizer Mode 2 that steadies the image during horizontal or vertical panning. Mode 2 detects the panning direction automatically. The closest focusing distance is 1.5 m (4.9 feet).