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Can you use a monolight strobe in [an Apollo JS Softbox]?
...What's a speed ring for?
Most monolights include an umbrella holder, and the Apollo softboxes are designed like square umbrellas, so they'll simply slide onto most monolights.
They'll also work with Speedlites, by mounting the Speedlite on an umbrella adapter fitted to the top of the light stand.
As whitewash said, a speedring is for use with traditional softboxes, beauty dishes, and other modifiers that hang onto the front of monolights and strobe heads. Since there are many different head designs, you need a speedring that is specific to the design you have.
No speedring is needed for the Apollos.
Here's a bit more info:
I've been using the 28" Apollo for several years, and now with the new 50" model being on sale I'm ordering one of them, too.
It looks so shallow, I'd have had my doubts, but several of the reviews indicate that people are using monolights in it.
Because the Apollos are retro-firing designs they can work quite efficiently even with relatively shallow depths.
Comparing with a few other sellers, that seems like a good price for that softbox. Must be a rebate going on?
Yep, F.J. Westott's "Summer Promotion."