f number

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Related to f-number: focal length, Numerical aperture
  • noun

Synonyms for f number

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

References in periodicals archive ?
Optical simulations have shown that the mirrors would need to be at least 12 millimeters in diameter in order to produce a zoom objective with a sufficient f-number.
The resulting f-number is inversely related to the eyes ability to admit light (Land 1985).
insignis was found in the AM eyes, which showed a considerably lower f-number than all other eyes in this species.
The optical speed or f-number (f) of the pinhole lens is important for the successful implementation of a covert camera system.
The aperture or f-number, also called f-stop, is equal to the distance between the lens and the focal point divided by the effective diameter of the lens.
6,416,164) entitled "Acoustic Ejection of Fluids Using Large F-number Focusing Elements".
Due to the low f-number (high light intensity), these lenses are also particularly well suited for high speed applications in the areas of semiconductor and electronics manufacturing, transportation as well as the food and medical sector, for example.