I've just bought 2 mamiya 645 cameras(an m645 super and a 645E)on ebay. I want to use a metz flashgun(I haven't decided which yet)with them. Which sca adaptor(s) do I need? Also,a while ago someone asked the filter size for a Mamiya 645 lens. If you have the front lens cap look at the back of it-the size is usually there.