These are the flash heads I have, the 2100-c. I have looked for a speedring to go on these, but I have not found one. I don't even know how you would attach a speedring to these. The head, is all one pc.
There is a speedring that will fit on these heads, but it is a bit clunky.
It does not rotate.
Photoflex did sell one, but I am not sure they do now.
It is for a four support softbox that has 5/16 inch ends that plug into holes on the speedring.
This speedring work OK for smaller softboxes, but is a pathetic solution for a large softbox.
The bare bulb Novatron heads accept a different speedring that is far more accommodating and functional.
Enjoy! Lon

