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Concepts de photographie
Vitesse d’obturation
La vitesse d’obturation désigne l’intervalle de temps entre l’ouverture et la
fermeture de l’obturateur. Elle contrôle la quantité de lumière qui passe à
travers l’ouverture avant d’atteindre le capteur d’images.
Généralement, la vitesse d’obturation est réglable manuellement. La
mesure de la vitesse d’obturation est connue sous le nom de «Valeur
d’exposition» (EV), qui se caractérise par des intervalles de 1s, 1/2s, 1/4s,
1/8s, 1/15s, 1/1000s, 1/2000s, et ainsi de suite.
Exposition
+1 EV
-1 EV
1 s 1/2 s 1/4 s 1/8 s 1/15 s 1/30 s
Vitesse d’obturation
Par conséquent, plus la vitesse d’obturation est élevée, moins la lumière
pénètre. De même, plus la vitesse d’obturation est faible, plus la lumière
pénètre.
Les photos représentées ci-dessous illustrent une vitesse d’obturation
lente laissant plus de temps à la lumière pour pénétrer dans l’objectif de
l’appareil photo. Cela engendre un eet de ou lié au mouvement des
objets. Par ailleurs, une vitesse d’obturation rapide accorde moins de
temps à la lumière pour pénétrer, ce qui tend à immobiliser un sujet en
mouvement sur la photo.
0,8 s 0,004 s
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