How many movies have Helmut Käutner and Henning Schlüter collaborated on?

They have worked on 4 movies together! Their first movie together was Leben wie die Fürsten (1966) while their highest rated movie together was Christoph Kolumbus oder Die Entdeckung Amerikas (1969). They have not worked together since Bend Sinister (1970). They are most known for their drama films together.