(intransitive, followed by on or upon) To concentrate during a task. / (transitive) To direct attention, effort, or energy to a particular audience or task.

(of an image) Sharp and clear with no fuzziness. / (idiomatic, of one's thoughts) Clearly perceived.

main purpose or center of interest or activity

(cinematography) A member of a film crew whose primary responsibility is to maintain the camera lens' optical focus on whatever subject or action is being filmed.

(film, television) A filming technique whereby the focal point is drawn towards the viewer; also a shot (as part of an edit) in which such a technique is used. Also used attributively.

(photography) The blur produced by spherical aberration in a lens, sometimes deliberately used to produce a dreamy effect or to eliminate blemishes.

plural of focus puller

Alternative spelling of focus group

(optics) A point from which light (or other radiation) apparently emanates, such as in the virtual image produced by a plane mirror.

A very intense focus (of the human mind); a hyperfocus.