Originally posted by atupdate Are you saying that the Promaster module fits the Quantaray flash unit?
Yes. It works as is with the Quantaray 6550U, 9550U, and Digital Macrolume. On the Macrolume the 5050DXR can't drop the flash output low enough for close macro work, but works for anything over 18-24 inches. It would work with the Tamron 70-300mm zoom's macro as the minimum focus distance is above 18 inches.
If you are willing the cut the plastic key off the flash, or replace the top plate of the 5050DXR module with the plate off the QDA-P module, the module can be used with all the older Quantaray modular flashes as well. Well, I've tried it the TTL Macrolume and the 9500A, but probably all will work. Flash voltage is under 6V
Thank you
Russell