Can anyone tell me the current medium format camera makers? The offerings for film cameras continue to dwindle -- from what I have seen -- with few offerings from Hasselblad, Mamiya, Fuji, Alpa and DHW Fototechnik. Can anyone tell me if there any others? I am particularly interested in cameras of durable natural materials. I would love to find something made with brass (like the Leica M series, but for medium format). Thank you.