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Elinchrom's shaft size is 7mm. If your are not going to buy the adapter at $100 (which I highly recommend) than I would look at the Elinchrom 41" Varistar umbrella kit. Really nice general purpose modifier. However, spend the dough on the adapter. It opens the Quadra to all kinda if great modifiers. Even the standard reflector with the translucent cap puts out nice light.