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Que vol dir el número f de la teva càmera - Bordils Fotografia

Bordils Fotografia

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Autor Missatge
EntradaPublicat: 14 abr. 2010 09:04 
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Membre des de: 26 oct. 2009 22:01
Entrades: 682
Ubicació: Bordils
el número f és bàsicament la relació entre la distància focal i el diàmetre del diafragma. f = df/D on df és la distància focal i D és el el diàmetre del diafragma. La notació correcte del número f és f/2.8, per exemple

Per aconseguir la meitat de llum és necessari tancar el diafragma a la meitat. Això és el que es coneix com tancar un pas de diafragma (1 f stop).
Si partim de f/1, el càlcul del número f segueix una progressió geomètrica on els passos són: f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128, etc.

Però les nostres càmeres són capaces de tancar els diafragmes en fraccions de pas (1/2 o 1/3 que és el més habitual), per tant podrem tenir valors f de l'estil: f/1.0, f/1.1, f/1.2, f/1.4, f/1.6, etc... Aquestes fraccions de pas de diafragma és el que en la vostra càmera equival a un punt més o menys (en les escales de la càmera).



Per tant obrir/tancar un pas el diafragma implica augmentar/reduïr al doble/meitat la quantitat de llum que entra per l'objectiu.

Ho teniu per la gent de dzoom.

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Si tens un moment pots mirar les meves , , o les , o més


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