sentences:  The designs are first rate, even today, but the Japanese competition came quite close to producing the same level of imagery.The Leitz designs had their own typical set of compromises that distinguished their lenses from the rest, but the best of Zeiss, Canon and Nikon and Topcon were measurably on the same level [...] The Mandler era delivered first rate lenses, but they were mainstream lenses that fitted into the Zeitgeist of the 35 mm style of photography.The innovations (zoomlenses) however were snatched away from Leitz by the Japanese companies."