film speedn.

Brit.

/ˈfɪlm spiːd/, U.S.

/ˈfɪlm ˌspid/

Origin: Formed within English, by compounding. Etymons: film n., speed n.

Etymology: < film n. + speed n.

1. Photography. 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.Originally determined as the rate at which a photographic film would darken when exposed to light of a specified strength.Film speed has historically been expressed using a number of different scales; in 1974 the ISO system was introduced, combining two earlier systems, the ASA and DIN standards.

ΘΚΠ

society > leisure > the arts > visual arts > photography > action of taking photograph > technical factors > [noun] > speed > film speed

film speed1899

1899 Photogr. News 10 Nov. 733/1 The camera used was a No. 3 Tella, aperture f/6.5, film speed about 120 H. & D.

1935 Pop. Sci. Mar. 120/3 Another method frequently used to increase film speed is pre-fogging. That is, the film is fogged slightly by action of light before it is exposed in the usual way.

1969 Pop. Mech. Dec. 129/1 The guide numbers range all the way from 30 to 69 for ASA 25, the film speed for Kodachrome II color film.

2013 Manch. Evening News (Nexis) 8 Nov. 2 He explained how he achieved the special effects using telephoto and macro lenses, and varying the film speed, possible on modern digital cameras.

2. Cinematography. The speed at which a cinematographic film passes through a camera or projector.

ΘΚΠ

society > leisure > the arts > performance arts > cinematography > filming > filming equipment > [noun] > film > film speed

film speed1901

1901 Sci. Amer. 20 July 36/2 I succeeded recently in attaining very good results with a film speed of 20 centimeters per second.

1951 R. Spottiswoode Film & its Techniques iv. 94 If there were countries which spaced their film perforations 60 to the foot instead of 64, or standardized a film speed of 20 frames per second, universal projection of movies would be impossible.

2002 Hotdog Feb. 78/1 He had the help of a director whose aim was to stretch the boundaries, like filming the German forests in negative and varying the film speed.

This entry has been updated (OED Third Edition, September 2016; most recently modified version published online March 2022).

单词	film speed
释义	film speedn. Brit. /ˈfɪlm spiːd/, U.S. /ˈfɪlm ˌspid/ Origin: Formed within English, by compounding. Etymons: film n., speed n. Etymology: < film n. + speed n. 1. Photography. 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.Originally determined as the rate at which a photographic film would darken when exposed to light of a specified strength.Film speed has historically been expressed using a number of different scales; in 1974 the ISO system was introduced, combining two earlier systems, the ASA and DIN standards. ΘΚΠ society > leisure > the arts > visual arts > photography > action of taking photograph > technical factors > [noun] > speed > film speed film speed1899 1899 Photogr. News 10 Nov. 733/1 The camera used was a No. 3 Tella, aperture f/6.5, film speed about 120 H. & D. 1935 Pop. Sci. Mar. 120/3 Another method frequently used to increase film speed is pre-fogging. That is, the film is fogged slightly by action of light before it is exposed in the usual way. 1969 Pop. Mech. Dec. 129/1 The guide numbers range all the way from 30 to 69 for ASA 25, the film speed for Kodachrome II color film. 2013 Manch. Evening News (Nexis) 8 Nov. 2 He explained how he achieved the special effects using telephoto and macro lenses, and varying the film speed, possible on modern digital cameras. 2. Cinematography. The speed at which a cinematographic film passes through a camera or projector. ΘΚΠ society > leisure > the arts > performance arts > cinematography > filming > filming equipment > [noun] > film > film speed film speed1901 1901 Sci. Amer. 20 July 36/2 I succeeded recently in attaining very good results with a film speed of 20 centimeters per second. 1951 R. Spottiswoode Film & its Techniques iv. 94 If there were countries which spaced their film perforations 60 to the foot instead of 64, or standardized a film speed of 20 frames per second, universal projection of movies would be impossible. 2002 Hotdog Feb. 78/1 He had the help of a director whose aim was to stretch the boundaries, like filming the German forests in negative and varying the film speed. This entry has been updated (OED Third Edition, September 2016; most recently modified version published online March 2022). < n.1899
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