At Ica, foreseeing a growing market in amateur and semi-professional movies, he designed an extremely compact 35 mm movie camera, the Kinamo, introduced in 1921 with a spring motor attachment added in 1923 to allow flexible handheld filming. Goldberg made films of himself and his family as promotional shorts and, in 1927, a skiing drama, "Ein Sprung... Ein Traum." The Kinamo was used by Joris Ivens and other avant-garde and documentary filmmakers in the late 1920s and early 1930s.