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Notions de base en photographie
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Valeur d’ouverture et profondeur de champ
En contrôlant louverture, vous pouvez flouter l’arrière-plan d’une photo ou le rendre plus net. Ceci
est étroitement lié à la profondeur de champ (DOF) qui peut être définie comme faible ou élevée.
Photo avec large profondeur de champ Photo avec faible profondeur de champ
Le diaphragme contient plusieurs lamelles. Ces lamelles se déplacent simultanément et contrôlent
la quantité de lumière qui passe à travers le centre de louverture. Lors de prises de vues réalisées
de nuit, le nombre de lamelles joue sur l’aspect de la lumière. Avec un nombre pair de lamelles, la
lumière se divise en un nombre égal de sections. Avec un nombre impair, le nombre de sections
double par rapport au nombre de lamelles.
Par exemple, un diaphragme doté de 8lamelles divise la lumière en 8sections et un diaphragme
doté de 7lamelles divise la lumière en 14sections.
7 lamelles 8 lamelles
173


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