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Notions de base en photographie
180
Une photo avec une faible profondeur de champ, qui met le sujet en évidence et dont le reste est
flou, peut être obtenue en utilisant un téléobjectif ou en sélectionnant une faible valeur d’ouverture.
À l’opposé, une photo avec une profondeur de champ élevée et dont chaque élément est nettement
mis au point peut être obtenue en utilisant un objectif grand angle ou en sélectionnant une valeur
d’ouverture élevée.
Faible profondeur de champ Large profondeur de champ
Quels sont les éléments qui contrôlent les effets hors mise au
point?
La profondeur de champ dépend de la valeur d’ouverture
Plus l’ouverture est large (par définition, plus la valeur douverture est basse), plus la profondeur
de champ est faible. Dans une situation où les autres valeurs telles que la vitesse d’obturation et la
sensibilité ISO sont égales, une faible valeur douverture résulte en une faible profondeur de champ
sur une photo.
50 mm F5.7 50 mm F22
180


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