Last Updated 2 days ago
Definition
Pulling focus means adjusting a lens’s focus during a shot. The adjustment may keep a moving subject sharp, compensate for camera movement or deliberately transfer sharpness between subjects. On a conventionally crewed film set, the 1st AC or focus puller usually performs this work.
The director and cinematographer decide what the audience should see clearly and when. The focus puller translates that intention into an accurate, repeatable action while responding to the actual performance.
Rack Focus
A rack focus is a deliberate visible change of focus from one distance or subject to another within a shot. For example, the shot starts with a glass sharp in the foreground, then shifts focus to the character watching it from across the room.
The crew may shorten the instruction to “rack to her.” Identify both the destination and the cue: “Start on the glass; rack to her as she looks up” is more useful than an instruction to change focus at an unspecified moment.
Focus pulling is the broader task. Keeping an actor sharp while they walk toward the camera is a focus pull, even when it does not create the dramatic transfer of attention associated with a rack focus.
Preparing the Pull
Rehearse the movement and establish the important subject positions. Marks and measured distances provide reference points, but an actor may lean, turn or adjust their pace during the take. The puller must account for what actually happens rather than following marks mechanically.
- Confirm the starting subject, ending subject and any intermediate focus points.
- Agree the cue and the desired speed of the transition.
- Check the lens, aperture and available depth of field.
- Rehearse camera movement together with actor movement.
- Review the result at a useful image size and adjust timing as well as accuracy.
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Tools and Monitoring
Focus can be adjusted directly on the lens, through a mechanical follow-focus unit or using an electronic motor and controller. The appropriate method depends on the camera rig, lens and working distance. Some setups also use autofocus or distance-measuring assistance.
A small multiview image may conceal a soft result. Where needed, check a dedicated camera feed rather than relying solely on a quad split. Lens breathing, image delay and monitor processing can affect what the crew sees while evaluating the move.
Depth of Field and Timing
Shallow depth of field makes the focus plane less forgiving. A wider aperture, longer focal length or closer working distance can make small errors more visible, depending on the complete shot. Closing the aperture can help, but it also changes exposure and the image’s intended separation.
A technically sharp endpoint can still arrive too early or late for the scene. A slow rack may let the audience anticipate a discovery; a quick change can make a sudden reaction legible. Rehearse the storytelling beat rather than treating every pull as a fixed-duration move.
Terms That Should Not Be Confused
Rack over refers to a mechanical viewing arrangement on certain film cameras. It is separate from racking focus. A follow-focus unit is a focus-control device. Soft focus can describe a deliberate optical rendering and should not automatically be used as a synonym for a missed focus mark.
See the camera department guide for the division of responsibilities between the operator, 1st AC and other camera crew.
Related Terms
Browse terms beginning with P or return to the filmmaking dictionary.