I am experimenting with a cyc wall painted white to achive the apple infinite white that is really popular now. But I'm trying to fiugre what the right foot candle or at least a ratio for lighting the white vs the subject.
I am shooting on a camera with a native ISO of 800
I have access to light the wall (16'x10') with various soft light instruments Kinoflow Arri 2k softs lots of 1ks with silks etc.
I can get a farily even wash on the wall, with in 1-3 foot candles, but i would really like to know if there is a secret sauce Foot candle that you gurus try and achive when working with the white cyc.
Just did this yesterday for a series of PSA's for the next Stand Up 2 Cancer Telethon.
The SOP is light the white to 80 IRE on your waveform wuth as straight a line across the scope as possible (you'll see some slight vignetting if your lens is wide open) and put the daces at the normal 60-65%. Volia!
Just as an aside, one of the things that makes this a whole lot easier is the trend for quality LCD small monitor manufacturers to build in "false color" algorithms.
I haven't used a scope for setting a key or solid background light field since I bought one of the Marshall monitors with that feature a few years back.
Much simpler than a scope, particularly since you can put a long cable on the small monitor and keep it with you while you're adjusting the lighting!
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