Although its telephoto
reach is limited compared with some of the other test lenses on test, the Z 100-400mm features high-tech attractions and handling exotica aplenty. Amazingly rapid and precise, the autofocus system is powered by dual linear stepping motors, which drive two independent focusing groups of elements. As with the Z 180-600mm on test, the choice of linear stepping motors gives the bonus of smooth and virtually silent autofocus transitions with video.