Carmen Miranda Offline Image Upload: Off
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Modeling lights will not affect your flash exposure.
Check out your manual to set modeling lights to proportional, but basically you have three options, OFF, PROPORTIONAL, INDEPENDENT. Try switching between them to see the difference.
An important general concept to learn and understand (especially in lighting, although it affects many things, in many ways) is the Inverse Square Law.
It states that light power either increases or decreases exponentially as the distance of the light to your subject decreases or increases respectively. "About 5 feet" could be 4' or it could be 6', in either case there would be a substantial difference in exposure. If you double your distance you get 1/4th the amount of light, if you decrease the distance by half you quadruple the amount, that is a 2 stop difference, which is huge.
It's possible your lights are closer than you think. If you are really up against it, than pulling your lights back a bit will help. Bouncing light effectively does the same thing by increasing the distance the light has to travel.
There are consequences to every action but at least light is VERY predictable, so with time and effort you'll find different ways to handle your situation, some better than others for a desired result.
A flash meter is indeed an invaluble tool. There are other ways to work around it until you get one though. Check out Chuck Gardners tutorials while your saving your sheckels. Also pick up the book Light, Science and Magic, a tad dry but a good investment and an invaluble resource on the basics of lighting.
Good luck.
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