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Exposure value equivalences in cinematography


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#1 Juan Manuel Cotes

Juan Manuel Cotes

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Posted 09 September 2010 - 07:59 PM

Im a student of cinematography and i need to know how to calculate the diaphragm with the Ev. I know that in 1/24 seg, and EV=12 the diaphragm is f=8, but i dont understand why in my exposimeter, when i have a EV= 12.8 the diaphragm its f=11 1/3... Thanks for your responses.
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#2 Mark Dunn

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Posted 10 September 2010 - 03:52 AM

An EV is one stop, so 0.8 EV is something between 2/3 and a full stop. So I'd say your meter means you to open up 1/3 stop from f11. Why it deosn't say f8 and 2/3rds I don't know.
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