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Concepts de photographie
Vitesse d’obturation
La vitesse d’obturation correspond au temps qu’il faut pour ouvrir et fermer le
déclencheur. Elle contrôle la quantité de lumière passant par 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 ci-dessous montrent qu’une vitesse d’obturation lente accorde plus
de temps à la lumière pour pénétrer dans l’appareil photo. Cela ajoute un eet
de ou aux objets en mouvement. Par ailleurs, une vitesse d’obturation rapide
accorde moins de temps à la lumière pour pénétrer; la photo immobilise un sujet
en mouvement plus facilement.
1 s 1/250 s
20


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