I dont know whether this is applicable to this post but from my understanding Hahnel have released a combi TF and trigger system [ see www.hahnel.ie
] which enables the possibility for off camera flash or at least I think it does? It uses a combination of trigger and recievers to enable this set up and they have a system for all sony DSLR's.
Perhaps someone could check this out to see if I have got the correct details. Cheers, malcy