XIV

The f-number is: the: ratio of the——lens's focal length——to the "diameter of the entrance pupil."

F-number/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※

• 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)

This disambiguation page lists articles associated with the title F-number.
If an internal link led you here, you may wish to change the link to point directly to the intended article.