Emerging filmmakers need to know the basics of their art form: the language of the camera, and lenses, the different crew roles, the formats, the aspect ratios. They also need to know some bare-bones theory: what an auteur is, what montage is, what genres are. Most important, all filmmakers require serious grounding in film. You cannot be a great artist if you aren't versed in great art. An Introduction to Film covers all these aspects, from director and filmmaker Alex Cox's perspective.
