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Nikon SB28 Manual

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Plage de portée du flash en mode synchro ultra-rapide
TTL 1/300 (F5 uniquement)
Avec le F5, il est possible d’utiliser le mode synchro ultra-rapide TTL 1/300
(avec le réglage personnalisé; 1/250 sec. en réglage standard). Mais il est
impossible de lire la portée maximale du flash sur l’échelle graduée du
SB-28 en mode flash auto TTL
t .
Dans ce cas, utilisez le tableau des nombres guides et l’équation suivante
pour calculer cette distance en fonction de la position du diffuseur-zoom.
nombre guide
D (portée maximale du flash) = ———————————
nombre f/ (ouverture)
Par exemple, avec un film 100 ISO, le diffuseur-zoom étant réglé sur 35mm et
l’ouverture sur f/5.6:
D = 14/5.6 = 2.5 (en mètres)
D = 46/5.6 = 8.2 (en pieds)
La portée maximale du flash est donc 2.5m (8.2 ft). Vous pouvez lire la portée
minimale du flash sur l’échelle graduée du SB-28.
• Pour les films d'une sensibilité autre que 100 ISO, multipliez les chiffres du tableau
ci-dessus par les facteurs indiqués ci-dessous.
30
Mode flash auto TTL
t
Nombre guide (à 100 ISO, en m/ft)
Position du diffuseur zoom
Nombre guide
18mm 20mm 24mm 28mm 35mm 50mm 70mm 85mm
8/26 8/26 11/36 12/39 14/46 16/53 18/59 19/62
Sensibilité de film ISO
Facteur
25 50 200 400 800
x 0.5 x 0.71 x 1.4 x 2 x 2.8
Pour les appareils du groupe I: uniquement le F5
… 30 …


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Nikon SB28 User Manual - English - 97 pages

Nikon SB28 User Manual - German - 98 pages


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