Metz flash adapter chart(PDA file)
Laemmermann Roland Roland.Laemmermann@metz.de
I suppose you use Metz flash.
I have a 503CW and Metz 45CL-4 flash.
SCA390 connects to the camera body and the lens.
Another SCA300A (which attaches to the top of SCA390) connects to the Metz flash.
For the missing cable,you need a PC to miniphone jack cable.(second link above)
I hope this helps you.
Please let me know if you still have a question.
Also you ask Metz directly (3rd link above),he is very helpful.
Koo Young Chung