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Het juiste diafragma berekenen
Om het juiste diafragma te berekenen, baseert u zich op de onderstaande vergelijking en
de tabel met richtgetallen, uitgaande van de ingestelde ISO-gevoeligheid, de flitssterkte
en de stand van de zoomkop:
f/stop (diafragma) = richtgetal (GN) x ISO-factoren ÷ opnameafstand (m)
Stel hetzelfde diafragma in op de SB-800 en op de camera of het objectief.
Het richtgetal berekenen
Bereken het richtgetal volgens onderstaande vergelijking, uitgaande van het
vereiste diafragma en de opnameafstand.
Richtgetal (GN) = opnameafstand (m) x diafragma x ISO-factoren
Bepaal, uitgaande van de tabel met richtgetallen, een geschikte flitssterkte die
overeenstemt met het hiervoor verkregen richtgetal en stel deze waarde in op de SB-800.
Bij manuele flits met afstandsprioriteit wordt het richtgetal (aanduiding van de hoeveelheid
licht gegenereerd door de flitser) automatisch bepaald door de SB-800 op basis van de
ingestelde onderwerpsafstand en het ingestelde diafragma.
ISO-gevoeligheidsfactoren
Voor films met een andere gevoeligheid dan 100 ISO moet u de richtgetallen
vermenigvuldigen met de factoren aangegeven in de onderstaande tabel.
De werking in detail
ISO 25 50 100 200 400 800 1600
Factoren x0,5 x0,71 x1 x1,4 x2,0 x2,8 x4
49


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