If you got umbrellas (normal size, not 3 meters.. those are still made too) - Hensel is only one who still makes now true parabolic ones, its damn expensive (about 100$) but its got similar effect. Used broncolor ones are popping up every now and then too. You can get in about same effect (wraparound with shadows) if you make butterfly (or clam-shell.. depending how you look at it) out of two regular umbrellas, but it requires some trials too.
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