focal ratio definition

  • noun:
    • the proportion regarding the focal size towards diameter of a (digital camera) lens system
    • the proportion of the focal size towards the diameter of a (camera) lens system
    • the proportion for the focal size towards the diameter of a (camera) lens system
    • the ratio associated with focal size towards diameter of a (digital camera) lens system
    • the ratio of this focal length toward diameter of a (digital camera) lens system
    • the proportion for the focal size on diameter of a (digital camera) lens system

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