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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
17


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