film speed

noun Photography.
speed ( def 5a ).

Origin:
1910–15

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World English Dictionary
film speed
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
So obviously you'd want to maximize what, back then, was a relatively slow film
  speed.
The general rule is the slower the film speed, the higher the quality of slide
  or negative.
Because of the film speed these actions appear faster than they actually were.
Choose the best film speed for various lighting and subjects.
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