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Noun: focal ratio  'fow-kul 'rey-show
  1. The ratio of the focal length to the diameter of a (camera) lens system
    - f number, stop number, speed

Derived forms: focal ratios

Type of: ratio

Encyclopedia: Focal ratio

Nearest

fob
fob off
fob watch
focaccia
focal
focal distance
focal epilepsy
focal infection
focal length
focal point
focal ratio
focal seizure
focalisation
focalise
focalization
focalize
focally
fo'c'sle
focus
focus group
focus on