One of my favorite ways to shoot is with accented rim lights. And while I love the look this kind of light produces there is a bit of a trickery to setting those lights up.
The reason is that back lights create flare.
David Hobby came up with a pretty clever way to block flare generating lights using a frame made from coroplast (the same material used for DIY flags, and grids).
While I have never tested this, I would imagine it would need to be a biggish frame to block lights coming at a wider angle, but even a smaller flag will help to reduce any flare coming from roughly camera front.
Control Flare from Sun, Rim Lights with a Shoot-Thru Gobo via strobist
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