focal ratio, f number, stop number, speed(noun)
the ratio of the focal length to the diameter of a (camera) lens system
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.
The numerical value of f number in Chaldean Numerology is: 5
The numerical value of f number in Pythagorean Numerology is: 7
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