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Profondeur de champ/L'échelle de
profondeur de champ
Les niveaux - parallèles au film - sur lesquels l'ob-
jectif est réglé sont reproduits en motifs de la plus
forte netteté. Ce niveau de netteté supérieur est
progressivement réduit vers l'arrière ou vers l'a-
vant de manière à créer une plage de profondeur
qui est reproduite de manière accentuée sur
l'image: la profondeur de champ. Elle dépend de
la mise au point de la prise, de la distance focale
de l'objectif (ce qui, ensemble, donne l'échelle de
l'image) et du diaphragme configuré. Diaphrag-
mer, à savoir configurer une valeur plus élevée,
accroît la profondeur de champ, ouvrir en fondu, à
savoir configurer une valeur plus faible, le réduit.
Avec l'échelle de la profondeur de champ (11c) on
peut relever sur la bague de mise au point (12) la
plage de la profondeur de champ pour chaque mi-
se au point réglée.
Si vous avez par exemple réglé l'objectif LEICA
SUMMILUX-M 1:1,4/50mm ASPH. sur 5m, la pro-
fondeur de champ s’étendra environ de 4,6m à
5,5m pour le diaphragme 1,4. Par contre, si vous
diaphragmez avec la même mise au point sur 16,
la profondeur de champ ira environ de 2,5m à l’in-
fini.
31


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