[1][2] Sørensen made his debut as a camera assistant for the Norwegian film comedy Den forsvundne pølsemaker (1941) and as a focus puller for the comedy En herre med bart (1942).

He made his debut as chief photographer with Nils R. Müller's Så møtes vi imorgen (1946).

He soon became one of Norway's leading photographers with major assignments for directors such as Arne Skouen, Kåre Bergstrøm, Rasmus Breistein, and Tancred Ibsen.

He particularly excelled in the black-and-white medium, and his most famous assignments were Arne Skouen's debut film Gategutter (1949),[3] Tancred Ibsen's Storfolk og småfolk (1951), Kåre Bergstrøm and Radoš Novaković's Blodveien (1955), and Bergstrøm's De dødes tjern[4] (1958, which was also the first Norwegian film created with CinemaScope).

[5] In the 1960s, he was the cinematographer for Tancred Ibsen's Venner (1960), Nils Reinhardt Christensen's Line (1961), and Arne Skouen's Om Tilla (1963).