If you have a potatomasher Metz, Photoflex and Chimera make an adapter that holds one of their regular softbox speed rings on the Metz. Chimera and Photoflex have small (16" x 22", Photoflex) / extra small softboxes ( also 16" x 22", Chimera) that fit the speed rings. I have a Chimera that I put on my Metz 45 on a light stand, triggered with radio slave and Auto output flash via a Metz photosensor that is not blocked by the softbox. I have not attempted to see if anything fits hotshoe flashes besides the Wescott MicroApollo true softbox, or the Photoflex and Lumiquest vinyl/inflatable units.