According to the production mixer, Michael Evje, the film began shooting at the Los Angeles Olympic Auditorium on April 16, 1979. Grips hung huge curtains of black duvetyne on all four sides of the ring area to contain the artificial smoke used extensively for visual effect. On May 7, the production moved to the Culver City Studio, Stage 3, and filmed there until the middle of June. Scorsese made it clear during filming that he did not appreciate the traditional way in films of showing fights from the spectators' view. He insisted that one camera operated by the Director of Photography, Michael Chapman, would be placed inside the ring as he would play the role of an opponent keeping out of the way of other fighters so that viewers could see the emotions of the fighters, including those of Jake. The precise moves of the boxers were to be done as dance routines from the information of a book about dance instructors in the mode of Arthur Murray. A punching bag in the middle of the ring was used by De Niro between takes before he aggressively came straight on to do the next scene. The initial five-week schedule for the shooting of the boxing scenes took longer than expected, putting Scorsese under pressure.