focusing

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

So rapidly were the objectives enlarging upon the plates that the automatic focusing devices could scarcely function rapidly enough to keep them in place. — Triplanetary, E. E. (Edward Elmer) Smith
(e) Motion Pictures (1) Projector operators can ruin newsreels and other enemy propaganda films by bad focusing, speeding up or slowing down the film and by causing frequent breakage in the film. — Simple Sabotage Field Manual, United States. Office of Strategic Services
The wave quality gave the electron the characteristic of light, and a search was begun to devise means for ‘focusing’ electrons in a manner similar to the focusing of light by means of a lens. — Autobiography of a Yogi, Paramahansa Yogananda

focus, focussing, focal point, direction, centering

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