film speed

noun

, Photography.

1. speed ( def 5a ).

film speed

noun

1. the sensitivity to light of a photographic film, specified in terms of the film's ISO rating
2. the rate at which the film passes through a motion picture camera or projector

Word History and Origins

Origin of film speed¹

First recorded in 1910–15

Example Sentences

Film speed, immediate development, portable sound equipment.

From Project Gutenberg