Do you have a Mamiya 6 or Mamiya 6 MF? I'm also unsure what exactly the difference between the two is.
Hi there. As it happens, I’ve got both versions. They’re exactly the same, except minor details. The 6 MF is a later model, and has a bit more markings in the viewfinder for different film formats (6x45 & 35mm). Apparently there are film adapters for these formats for the 6 MF, although I really don’t see the point as I believe they’re just masks — film transport doesn’t change so for 645 you’d still get 12 shots per roll… doh.
It’s an awesome camera with fantastic lenses, but I’m sure you know that already. :)
Hope that helps,