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Measuring light ratios

Measuring light ratios

From the course: Pro Video Tips

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Measuring light ratios

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- Now I saved the trickiest part for last, because if I haven't told you, I really hate math. However to use lighting ratios, we're going to have to do a little bit of math on set, but I'll try to keep it simple, because I really couldn't do it any other way. Before we begin measuring our lighting ratios and f-stops, I just want to quickly review the relationship between f-stops and the relative difference in the amount of light that each f-stop represents. Each increment in f-stop represents an aperture that lets half as much light into the lens as the aperture before it. Starting at the widest aperture on this f-stop scale of f1.4 as we move up in f-stops by closing down our aperture, we're cutting the amount of light in half. So, f2.0 would be half the light of f1.4. If we close down our aperture to f2.8 from there, it's half the light we got at f2.0, and if we close down the aperture further to f4, it would let in half the amount of light we got at f2.8, etcetera, all the way…

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