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FRANÇAIS
6. Fonctions avancées
1. Mesure du contraste de la lumière
Cette méthode est utilisée pour vérifier l’éclairage en studio ou les inégalités
d’éclairage.
1) Monter l’accessoire Lumidisc (voir la page 8).
2) Allumer (ON) seulement la source
lumineuse principale.
Pointer le Lumidisc vers la source
lumineuse principale à partir de la position
du sujet et mesurer.
3) Ensuite, allumer seulement la source
lumineuse auxiliaire.
En cet état, pointer le Lumidisc vers la
source lumineuse auxiliaire et mesurer.
4) Déterminer le taux de luminance (taux de
contraste) à l’aide des valeurs mesurées
des sources lumineuses principale et
auxiliaire.
RÉFÉRENCE: Pour déterminer l’exposition à la lumière incidente, allumer les
sources lumineuses principale et auxiliaire, pointer le
Lumisphere sur l’axe de l’objectif de l’appareil, puis mesurer.
Taux de contraste
1 2:1
1.5 3:1
2 4:1
3 8:1
4 16:1
5 32:1
Différence EV des
valeurs mesurées
21


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