Well, with the diffusion sock fitted it really just becomes a softbox. And, as Phil pointed out, beauty dishes need to be used with lights that are barebulb anyway. They work perfectly well with the Atom, the extra power helps but the real difference is that the Atom is barebulb.
Thanks, some ideas for me to play with.
here is the back of my BD where you can insert speedlights, is this a problem for the atoms? and it's not a tight fit around the flash head - I don't suppose that makes a difference?
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