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Lighting to a specific F-stop


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#1 Nick Castronuova

Nick Castronuova
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Posted 09 February 2008 - 08:27 AM

Can someone here please explain to me how exactly to light to a specific f-stop? I know a lot of the general principles, but I was wondering the ratio/etc between the different lights (key, fill, background, etc).

For instance, if you are lighting to an 8, does that mean that your key light will be the 8 and the rest of the lights will follow based on the given ratio? Thanks.

Nick
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#2 David Mullen ASC

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Posted 09 February 2008 - 11:16 AM

You have to first decide what in the frame is "at key", normal brightness. It may be the subject's face -- but not always. That's a creative decision.

Sure, you then stick out your incident meter and get the key light to the f-stop level you want. If you shoot at that f-stop level, then all your other lights have to be balanced to that. If your key is f/8 and you want the fill to be three stops under that, the fill should read f/2.8.
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