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
See also
edit- F-ratio (disambiguation)
- F scale (disambiguation)
- F1 (disambiguation)
- a filial number or filial generation number, such as in the case of F1 hybrids, or F2, F3, etc.
- Fujita scale, a rating of a tornado's intensity by its impact on structures and vegetation
- function keys (on a computer keyboard, F1, F2, F3, etc.)
- F2 (disambiguation)
- F3 (disambiguation)
- F15 (disambiguation)
- F150 (disambiguation)
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