The f-number is the ratio of the lens's focal length to the diameter of the entrance pupil.
F-number or F number also may refer to:
- F number (chemistry), is a number that can be calculated for polycyclic aromatic hydrocarbons from their structure
- Fujita scale, a rating of a tornado's intensity by its impact on structures and vegetation
- F number in the cross-breeding of hybrid animals such as the Savannah cat, a number that indicates the number of generations of distance from wild stock
See also
- F-ratio (disambiguation)
- F scale (disambiguation)
- function keys (on a computer keyboard, F1, F2, F3, etc.)
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