information:highlighting, information:filtering, information:classification
Cinematography

The most innovative technical aspect of Citizen Kane is the extended use of deep focus, where the foreground, background, and everything in between are all in sharp focus. Cinematographer Toland did this through his experimentation with lenses and lighting. Toland described the achievement in an article for Theatre Arts magazine, made possible by the sensitivity of modern speed film:

New developments in the science of motion picture photography are not abundant at this advanced stage of the game but periodically one is perfected to make this a greater art. Of these I am in an excellent position to discuss what is termed "Pan-focus", as I have been active for two years in its development and used it for the first time in Citizen Kane. Through its use, it is possible to photograph action from a range of eighteen inches from the camera lens to over two hundred feet away, with extreme foreground and background figures and action both recorded in sharp relief. Hitherto, the camera had to be focused either for a close or a distant shot, all efforts to encompass both at the same time resulting in one or the other being out of focus. This handicap necessitated the breaking up of a scene into long and short angles, with much consequent loss of realism. With pan-focus, the camera, like the human eye, sees an entire panorama at once, with everything clear and lifelike.

Another unorthodox method used in the film was the low-angle shots facing upwards, thus allowing ceilings to be shown in the background of several scenes. Every set was built with a ceiling which broke with studio convention, and many were constructed of fabric that concealed microphones. Welles felt that the camera should show what the eye sees, and that it was a bad theatrical convention to pretend that there was no ceiling—"a big lie in order to get all those terrible lights up there," he said. He became fascinated with the look of low angles, which made even dull interiors look interesting. One extremely low angle is used to photograph the encounter between Kane and Leland after Kane loses the election. A hole was dug for the camera, which required drilling into the concrete floor.

Welles credited Toland on the same title card as himself. "It's impossible to say how much I owe to Gregg," he said. "He was superb." He called Toland "the best director of photography that ever existed."