F-stop definition

ĕfstŏp
A camera lens aperture setting that corresponds to an f-number.
noun
0
0
(photog.) Any of the calibrated settings for an f-number.
noun
0
0
(Focal-STOP) The f-stop is the "aperture" opening of a camera lens, which allows light to come in. It also determines how much is in focus in front of and behind the subject (see depth of field). The f-stop is one of the two primary measurements of a camera lens. The other is the "focal length," which establishes how much of the scene is in view (see focal length).Length Divided by OpeningThe f-stop is the focal length of the lens divided by the diameter of its opening. Each consecutive f-stop halves the opening of the previous. For example, an 80mm lens with its f-stop set to f8 means that the optics inside the lens create a diameter equivalent to 10mm. Changing the f-stop to f16 creates a diameter of 5mm. See focal length.
0
0
(photography) Any of the discrete steps or stopping points for adjusting the aperture of a lens, either marked on a ring on the lens and adjusted by rotating that ring or marked in the display of a digital camera and adjusted by buttons or touch-sensitive controls.
noun
0
0
Alternative spelling of f-stop.
noun
0
0
Advertisement

Other Word Forms

Noun

Singular:
f-stop
Plural:
f stops

Origin of f-stop

  • f(ocal length) stop

    From American Heritage Dictionary of the English Language, 5th Edition