 Contrary to legend, this film did use artificial lighting.  Artificial lights were used, for example, in the scene where Brian  learns hes getting a horse. However, it is true that no artificial  lighting was used for candlelit scenes. A lens built by the Carl  Zeiss company for NASA, a 50mm Zeiss lens modified with the  Kollmorgen adaptor used in still cameras, was used to shoot scenes  lit only by candlelight.