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Footcandles to f-stops

COW Forums : Lighting Design Pros

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anthony miles
Footcandles to f-stops
on Aug 11, 2004 at 5:29:48 am

Dear knowledgeable bovine,
I would greatly appreciative of info relating to the conversions for F-stops to Foot candles. If anyone has a formula for figuring this out that would be great. I understand well how to get a reading on my meter and control contrast but it would be helpful to understand how the f-stops relates to foot candles.

Example: I have set my meter to ISO 320 at 24fps or 1/48th sec. and the meter reads f 2.8.

Is there a way to understand how many foot candles are falling on the subject when I read the meter. I know much of the info on film stocks is related to in foot candles, for example "100 ft candles or 10 ft candles to achieve normal exposure". This info would be very helpful in planning & figuring the overall light requirements for lighting different scenes.

Thanks greatly,
Anthony Miles

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