Leni Riefenstahl's Triumph of the Will (1935)—documenting the 1934 Nuremberg Rally—and Olympia (1938)—covering the 1936 Summer Olympics—pioneered techniques of camera movement and editing that influenced later films. New techniques such as telephoto lenses and cameras mounted on tracks were employed. Both films remain controversial, as their aesthetic merit is inseparable from their propagandising of National Socialist ideals.[475][476]