phase makes an adapter that mounts a 645 phase back to a RZ...there is a cable but it is a working solution.....mamiya claims that their (soon to be released) RZ ZD adapter will do the same without cables...it has all the contacts in the right places....they say that it works with leaf backs, obviously with their ZD back and that it should work with phase backs....but they have not tested yet...it will be available in about 6-8 week (when the ZD back comes out in the US)....it will be about 1000$..the phase back is about 1200$ and available right now...and we know it works....
i did not know about eco-digital, but i see no contacts on the pics, so i am sure there must be a cable somewhere...so it is the same as the phase....
