Calcolo del diaframma in base alla distanza, 104

Utilizzo del ﬂash incorporato

Distanza e diaframma usando il ﬂash incorporato

■Fotografando col ﬂash, esiste una relazione tra il numero guida, il diaframma e la distanza del soggetto. Calcolare se il ﬂash non è sufﬁciente e regolare di conseguenza le condizioni di ripresa.

●Numero guida del ﬂash incorporato

Sensibilità	Numero guida del ﬂash incorporato
ISO 100	13
ISO 200	18.4
ISO 400	26
ISO 800	36.7
ISO 1600	52

Calcolo del diaframma in base alla distanza

La formula seguente calcola il diaframma in base alla distanza di ripresa.

Diaframma F = Numero guida ÷ Distanza di ripresa

Esempio)

Con sensibilità [ISO 200] e distanza di ripresa 6.1 m, il diaframma risulta: F = 18.4 ÷ 6.1 = 3

Se il numero risultante (3, nell’esempio sopra) non è tra quelli previsti per il diaframma, normalmente si usa il più vicino numero inferiore (2,8, in questo caso).

Calcolo del campo di utilizzo in base al valore del diaframma

■La formula seguente calcola la distanza tra ﬂash e soggetto per diversi valori di diaframma.

Distanza massima del ﬂash L1 =	Numero Guida ÷ Diaframma
Distanza minima del ﬂash L2 =	Distanza massima del ﬂash ÷ 5*

*Il valore 5 utilizzato nella formula è una costante riferita all’uso del solo ﬂash incorporato.

Esempio)

Quando la sensibilità è [ISO200] e il diaframma F4

L1 = 18.4 ÷ 4 = 4.6 (m) circa

L2 = 4.6 ÷ 5 = 0.9 (m) circa

Quindi il ﬂash può essere impiegato a distanze comprese tra 0.9 m e 4.6 m circa. Non è possibile utilizzare il ﬂash quando la distanza del soggetto è inferiore a 0.8 m. Utilizzando il ﬂash a distanze minori di 0.8 cm, si ottengono zone sfumate ai bordi della fotograﬁa, la luce non è distribuita in modo uniforme e l’immagine può risultare sovraesposta.

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ER-GX20ZBBA/E1, ER-GX20ZBBB/E1, ER-GX20ZBBC/E1, ER-GX20ZBBA/IT specifications

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Samsung ER-GX20ZBBB/E1, ER-GX20ZBBC/E1 manual Calcolo del diaframma in base alla distanza, 104

Models: ER-GX20ZBBA/E1 ER-GX20ZBBB/E1 ER-GX20ZBBC/E1 ER-GX20ZBBA/IT