Scott Kelby on The Pro Trick for Better-Looking People Shots
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One inside tip a lot of big pros use when they're shooting portraits with small off-camera flash is to put a very light orange gel over the flash. It doesn't matter what time of day it is, that orange gel is over the front of their flash. The type of gel is called a ¼-cut of CTO (Color Temperature Orange). If you shoot people, I'd keep this on there all the time for better, more natural-looking color from your flash shots.