The ef 70 300mm f4 56l is usm is part of canons prestigious l series offering performance excellence with a versatile zoom range and superb image quality in a robust and compact design high performance telephoto zoom lens with a focal length range of 70 300mm the ef 70 300mm f4 56l is usm is a compact and versatile telephoto zoom lens delivering exceptional image quality ideal for wildlife and sports photographers as well as photo journalism and portraiture l series quality the l series