Umbrellas are a great first light mod: cheap, easy to use, easy to transport. But softboxes can give you more control, both in the beam's edge and with reduced light leakage. The photo above was shot with a single speedlight and a small softbox.

Today we'll look at how to choose a softbox that will marry well with your speedlight, and do so without spending a lot of money.

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http://strobist.blogspot.com/2018/08/slc-oe-03-how-to-choose-softbox-for.html