One of the mysteries of the English language finally explained.
1Photography. The degree of light sensitivity of a photographic film; a numerical measure of this. In later use also: a numerical measure of the signal gain of the photosensor in a digital camera.
2Cinematography. The speed at which a cinematographic film passes through a camera or projector.
Late 19th century. From film + speed.
film speed/ˈfɪlm spiːd/
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