Don't think of them as interchangable. Softboxes and
umbrellas server some different purposes. Umbrellas diffuse
more.
(And I'm talking about reflecting indirectly off an umbrella rather than
directly through one, that giving a similar result as the use of a softbox.)
I use a softbox when WANT to stop down further.
That allows me to make the background drop out more.
And there are other reasons.
When you want more light and more contrast, shoot more directly. (soft box)
When you want softer light, softer shadows, lower contrast, diffuse the light
more with indirect reflections. (Umbrella)
Sincerely,
C. Brendemuehl
Caveat: This information should be viewed critically. It may merit as much
technical excellence as a CBS news report.
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