Canon EF 100-400mm f/4.5-5.6L IS II USM LensThe EF100 400mm f 4. 5 5. 6L IS II USM is compact size, wide zoom range for versatile scenes, and high speed precision lens that is well suited for many genres of photography including aviation, sports, and nature. With the use of one fluorite lens in conjunction with a super UD (Ultra Low Dispersion) lens, chromatic aberration is reduced and this results in outstanding image quality across its entire range of focal distances. The EF100 400mm f 4. 5