Shifting focus from one subject to another within a single shot — directs the viewer's attention.
Technical Details
The focus pull is controlled via the lens's focus ring, with modern lenses like the Zeiss CP.3 or ARRI Signature Primes offering a focus throw of 300-320 degrees. In digital cameras with 4K resolution, the depth of field at an aperture of f/2.8 and a 50mm focal length is limited to a range of approximately 0.6 meters at a subject distance of 3 meters. Follow focus systems like the ARRI cforce mini enable motorized focus pulls at speeds of 0.1-360 degrees per second. Precise markings on the focus ring, usually indicated with white tape, define the start and end points of the movement.
History & Development
The technique developed in parallel with the introduction of deep depth of field as a visual tool in the 1930s. Gregg Toland perfected extreme depth of field and deliberate focus shifts in "Citizen Kane" (1941). In the 1970s, cinematographers like Gordon Willis ("The Godfather") and Conrad Hall ("Butch Cassidy") established focus pulling as a standard technique. Digital follow focus systems since 2010 now allow for programmable focus pulls and repeatability for multiple takes.
Practical Application in Film
In "The Graduate" (1967), the focus pull in the bar scene shifts the viewer's attention from Benjamin in the foreground to Mrs. Robinson in the background, visualizing his mental distraction. The Coen Brothers use abrupt focus shifts in "No Country for Old Men" (2007) to build suspense. The workflow requires precise collaboration between the cinematographer and the focus puller: distances are measured before each take, marks are set, and the speed of movement is rehearsed. Focus pulls are significantly more challenging during handheld shots, as both movements must be coordinated.
Comparison & Alternatives
In contrast to rack focus, which exclusively transitions between two defined focus points, focus pulling can incorporate multiple intermediate points. Focus breathing describes unwanted focal length changes during a focus pull, a problem that high-quality cine lenses minimize. Modern alternatives include programmable motors and real-time tracking systems that automatically follow people or objects. Split-focus techniques with longer focal lengths sometimes replace elaborate focus pulls with skillful depth of field partitioning.