Definitions for f number

This page provides all possible meanings and translations of the word f number

Princeton's WordNet

  1. focal ratio, f number, stop number, speed(noun)

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


  1. F number

    F number is a number used in the chemistry of polycyclic aromatic hydrocarbons as a descriptor of their molecular size. It was proposed by R.J. Hurtubise et al in 1977.


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