Frits Lamberts, an amateur, started taking photography seriously in the summer of 1943 when he was given the Leica of his deceased friend Aztla Kruisinga. Aztla’s father was a notary and kept a detailed diary during the German Occupation. His son and Frits Lamberts took photographs for the diary. After Aztla’s death, Frits Lamberts pursued these photographic activities alone. After the Liberation, Lamberts used some of the photographs to compile an album himself. The Kruisinga diaries are kept at the Nederlands Instituut voor Oorlogsdocumentatie in Amsterdam.

When it proved impossible to find work in his old field of marine engineering, Lamberts decided to become a professional photographer. In 1947, he worked for four or five months for the photographer Drent in Arnhem and then with the film company Niestad in Hilversum until 1952. After that he worked until 1981 as a school photographer.