F-number

F-number

In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. The number is commonly notated using a hooked f, i.e. f/N, where N is the f-number.
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F-number
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F-number

In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. The number is commonly notated using a hooked f, i.e. f/N, where N is the f-number.
http://dbpedia.org/resource/F-number
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25بك المحتوى هنا ينقصه الاستشه ...... فتحة العدسة بشكل اوتوماتيكي..
@ar
Die Blendenzahl, auch Öffnungs ...... chnet (für Englisch f-number).
@de
Em óptica uma abertura é algo ...... ema seja relativamente grande.
@pt
En óptica, el número f o relac ...... fracción de una unidad: 1:16.
@es
F値 （エフち、英: F-number）とは、レンズの焦点距 ...... する場合もあるが、これと混同してf2とする表記は誤りである。
@ja
Het diafragmagetal of de diafr ...... even of korte teleobjectieven.
@nl
Il rapporto focale indica il r ...... può essere espresso come f/2.
@it
In optics, the f-number (somet ...... f/N, where N is the f-number.
@en
L'ouverture d'un objectif phot ...... qui désigne tout autre chose.
@fr
Относительное отверстие объект ...... х с воздухом и деталях оправы.
@ru
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25بك المحتوى هنا ينقصه الاستشه ...... فتحة العدسة بشكل اوتوماتيكي..
@ar
Die Blendenzahl, auch Öffnungs ...... eiligen Objektives vorgegeben.
@de
Em óptica uma abertura é algo ...... ema seja relativamente grande.
@pt
En óptica, el número f o relac ...... un sistema óptico cualquiera:
@es
F値 （エフち、英: F-number）とは、レンズの焦点距 ...... する場合もあるが、これと混同してf2とする表記は誤りである。
@ja
Het diafragmagetal of de diafr ...... de diafragma-opening” genoemd.
@nl
Il rapporto focale indica il r ...... può essere espresso come f/2.
@it
In optics, the f-number (somet ...... f/N, where N is the f-number.
@en
L'ouverture d'un objectif phot ...... e un échelle logarithmique ː .
@fr
Относительное отверстие объект ...... х с воздухом и деталях оправы.
@ru
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Abertura (óptica)
@pt
Blendenzahl
@de
Diafragmagetal
@nl
F-number
@en
F値
@ja
Número f (óptica)
@es
Ouverture (photographie)
@fr
Rapporto focale
@it
Относительное отверстие
@ru
عدد البؤرة
@ar
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