This compact telephoto lens comes with an Image Stabilizer that compensates for camera shake so you can shoot at up to 4 shutter speed steps slower without blur. The lens's optical system uses one fluorite lens element and two UD lens elements to render high-resolution, high-contrast image quality at all zoom lengths.
Another attraction of this lens is its circular aperture diaphragm, which creates beautiful blur. The dust-proof and drip-proof*1 construction, along with fast and quiet AF and manual focus override, makes this lens an excellent performer in the field.
*1 Dust-proof and drip-proof models: EOS 1Ds Mark III, EOS 1Ds Mark II, EOS 1Ds, EOS 1D Mark III, EOS 1D Mark II N, EOS 1D Mark II, EOS 1D, EOS 1V/HS, Extender EF1.4xII, Extender 2xII