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Concepts de photographie
Valeur d’ouverture et profondeur de champ
En contrôlant l’ouverture, vous pouvez rendre l’arrière plan d’une photo plus ou
ou plus net. Ceci est étroitement lié à la profondeur de champ (DOF) qui peut être
dénie comme faible ou élevée.
Photo avec une profondeur de champ élevée Photo avec une profondeur de champ faible
L’intérieur de l’ouverture contient plusieurs lamelles. Ces lamelles se déplacent
simultanément et contrôlent la quantité de lumière qui passe à travers le centre de
l’ouverture. Lors de prises de vues réalisées de nuit, le nombre de lamelles joue sur l’aspect
de la lumière. Pour un nombre donné de lamelles dans l’ouverture, la lumière est divisée
par le nombre de sections correspondant. Si le nombre de lamelles est impair, le nombre
de sections est double.
Par exemple, une ouverture disposant de 8 lamelles divise la lumière en 8 sections alors
qu’une ouverture disposant de 7 lamelles la divise en 14 sections.
7 lamelles 8 lamelles
19


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