focal ratio

Definitions of focal ratio
  1. noun
    the ratio of the focal length to the diameter of a (camera) lens system
    synonyms: f number, speed, stop number
    see moresee less
    type of:
    ratio
    the relative magnitudes of two quantities (usually expressed as a quotient)
Cite this entry
Style:
MLA
  • MLA
  • APA
  • Chicago

Copy citation
DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘focal ratio'. Views expressed in the examples do not represent the opinion of Vocabulary.com or its editors. Send us feedback
Word Family