Descended from a wealthy family of landowners in what was then Austria-Hungary, Franz Planer understood the importance of photography as an art form early in his life. He first stood behind the camera as a portrait photographer, working out of Vienna from 1910. He soon branched out, filming newsreels in Paris and, in 1919, joined the growing German film industry as chief cameraman for Emelka (which became Bavaria Studios in 1932), in Munich. During the 1920s and early 1930's, he acquired a reputation for style, having worked as cinematographer for such distinguished directors as F.W. Murnau and Wilhelm Thiele, most of his films being commercially popular entertainments.

Anticipating the "Anschluss" - the forcible annexation of Austria by Nazi Germany under Adolf Hitler - Planer left Austria in 1937 and, using the pseudonym Frank F. Planer, sought work in Hollywood. He joined the American Society of Cinematorgaphers and was signed under contract at Columbia from 1938-45, and, again, from 1949-50 (in between working at Universal from 1947-49), filming in a variety of different genres. At this stage in his career, he often used real-life locations and shot primarily in black-and-white, in almost semi-documentary style. Like other European cinematographers, he was heavily influenced by German expressionism and used chiaroscuro lighting and stark contrasts between light and shade to achieve thematic mood requirements - particularly for films noir, such as Criss Cross (1949) and 711 Ocean Drive (1950). Planer's creative collaboration with director Max Ophüls is frequently cited as among his best work, notably the melancholic romantic drama Letter from an Unknown Woman (1948).