Canon EF 70-200mm f/4L IS USM is the latest addition to Canon's range of 70-200mm telephoto zooms and fills in the whole in Canon's lineup previously consisting of two faster f/2.8 variants (EF 70-200mm f/2.8L IS USM and EF 70-200mm f/2.8L USM) and another f/4 version (EF 70-200mm f/4L USM).