Almost since it was patented in 1889 by George Eastman, when Queen Victoria was on the English throne, the Eiffel Tower was inaugurated in Paris, and The Coca-Cola Company was incorporated in Atlanta, celluloid 35mm has been the format of choice for the film industry. It has fought off all comers to its pre-eminence until now, as the digital revolution that has affected all aspects of our lives finally turns its attention to the cinema.