The F-number, also known as the f-stop, is a numeric scale that represents the ratio of the focal length of a lens to the diameter of the aperture (the opening through which light enters the camera). It is a key factor in photography and optics that affects the exposure and depth of field of an image.

Ancestors (6)

  1. Dimensionless numbers
  2. Numbers
  3. Arithmetic
  4. Fields of mathematics
  5. Mathematics
  6. Home

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