Born in Islington in London, England, Francis originally planned to become an engineer. At school, a piece he wrote about films of the future won him a scholarship to the North West London Polytechnic in Kentish Town. He left school at age 16, becoming an apprentice to photographer Louis Prothero. Francis stayed with Prothero for six months. In this time they photographed stills for a Stanley Lupino picture made at Associated Talking Pictures (later Ealing Studios). This led to his successively becoming a clapper boy, camera loader and focus puller. He began his career in films at British International Pictures, then moved to British and Dominions. His first film as a clapper boy was "The Prisoner of Corbal" (1936).