FOCAL RATIO

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

The ratio of the focal length to the diameter of a (camera) lens system

Synonyms:

f number; focal ratio; speed; stop number

Classified under:

Nouns denoting relations between people or things or ideas

Hypernyms ("focal ratio" is a kind of...):

ratio (the relative magnitudes of two quantities (usually expressed as a quotient))

Credits