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6. Eclairage indirect au flash
52
6.1 Flash indirect en mode automatique
Avant de prendre la photo, il est conseillé de vérifier
si la lumière est suffisante pour l’ouverture sélec-
tionnée. A cet
effet, procédez comme indiqué au
chapitre „9. Témoin de
bonne exposition“.
6.2 Flash indirect en mode manuel
Lorsque le flash est utilisé en mode manuel, il est
conseillé de déterminer l’ouverture requise au moy-
en d’un posemètre/
flashmètre. Si on n’en dispose
pas, on pourra utiliser la formule
ouverture =
nombre-guide
distance flash-sujet x 2
pour calculer une valeur d’ouverture du diaphragme
que l’on devrait encore corriger de ± 1 division pour
la prise de vue.
Cette formule n’est valable que pour des piè-
ces avec une hauteur de plafond normale.
Le
nombre-guide
peut être relevé dans le tableau
du chap.
12. „Fiche technique“ en fonction de la sen-
sibilité du film utilisé.
La
distance flash-sujet
est l’éloignement du
sujet par
rapport à l’appareil photo portant le flash.
Orientation du réflecteur:
Tenir le mecablitz dans une main et avec l’autre
retirer la tête du réflecteur vers l’avant du boîtier.
Maintenant le réflecteur peut être orienté verticale-
ment vers le haut de 80° environ.
ĸ
52


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