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En la calculadora de diafragmas del flash se
puede leer el diafragma necesario 2,8. Este
valor hay que ajustarlo en la cámara o en el
objetivo.
6.2.3 Funcionamiento manual del flash con
cálculo del número guía
El diafragma de la cámara también se puede
determinar mediante la siguiente fórmula:
número guía
Diafragma = ——–——–——–—————
distancia de iluminación
El número guía para las sensibilidades de la
película empleada se puede tomar de la tabla
del capítulo “Características técnicas”.
La distancia de iluminación es la que existe
entre la cámara y el sujeto.
Ejemplo:
Se está empleando una película con sensibili-
dad 100 ISO y un objetivo de 50 mm. El suje-
to se encuentra a una distancia aprox. de 3 m.
De la tabla se toma el número guía 20.
El cálculo es: diafragma = 20 ÷ 3 = 6,66
En la cámara o en el objetivo hay que ajustar el
diafragma 5,6
7. Técnicas de destello
7.1 Destellos de aclaración con luz de día
El flash también se puede emplear para destel-
los de aclaración con luz de día, para elimi-
nar sombras y conseguir una exposición equi-
librada, incluso con tomas a contraluz.
111
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705 47 0068.A1 31.01.2006 13:45 Uhr Seite 111
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