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Exemple: diaphragme 5,6 / ISO 100 = portée
max. 3,6 m
A la prise de vue, il est conseillé de respecter
une distance minimale entre le flash et le sujet
afin d’éviter le risque de surexposition. La dis-
tance minimale est d’environ 10 % de la por-
tée maximale.
Le sujet est placé idéalement s’il se trouve
dans le tiers médian de la zone entre la
distance minimale et la portée maximale
pour laisser à l’électronique du reflex une
latitude suffisante pour doser la lumière.
Exemple :
Vous utilisez un film de 100 ISO et un objectif
de 50 mm. Le calculateur de diaphragme
montre que vous pouvez choisir entre les dia-
phragmes automatiques 2,8.
La distance entre appareil et sujet est d’environ
5 m.
Vous choisirez donc le diaphragme automati-
que 2,8 “vert” (portée maximale donnée par
le calculateur de diaphragme : 7 m environ).
Positionner le sélecteur de diaphragme du
flash sur le diaphragme automatique voulu,
c’est-à-dire sur “2,8 0 = vert”.
Attention avec les objectifs zooms ! De
par leur construction, ils peuvent occa-
sionner une perte de lumière entre une et
trois divisions de diaphragme. Ils peuvent
aussi avoir des ouvertures effectives diffé-
31
ll
705 47 0068.A1 31.01.2006 13:45 Uhr Seite 31
31


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