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#1 David Calson

David Calson
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Posted 11 April 2009 - 11:36 AM

Let's say a light is giving me 800 footcandles, I slap on a ND gel that dims the light 1 stop, how many footcandles would I have then? Is there a formula to help calculate this? Thanks!
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#2 Aaron Moorhead

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Posted 11 April 2009 - 03:12 PM

Yup, and an easy formula too. You'll have 400 footcandles. One stop up is a doubling of footcandles. One stop down is a halving of footcandles.

Another easy and useful footcandle formula is to take your film stock's speed and divide it into 10,000. It will give you how many footcandles you'll need to expose properly at a T2.8.

Example: You're shooting 5219/7219. Your ASA is 500.

10,000/500 = 20. You need 20 footcandles to expose a subject properly at a T2.8.

Enjoy!
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