As many lurkers here I'm considering moving up to the medium format. For many reasons, Mamiya 645 appears to be a good entry-level choice that could grow in many possible directions as far as one's budget allows.
I'd like to know the following though:
1. How far does M645 film back/insert compatibility go? Are they the same for 645 Pro, AF, AFD and AFDII? What are the limitations, if any?
2. Mamiya offers factory upgrades of AF and AFD models to AFDII level. How much are they (ballpark)? I know I could ask Mamiya but someone here may know...
3. Do you miss the waist-level finder option? I got one for my Nikon F4 and I used it very rarely, but with a nice big 645 finder it's more tempting.
Thanks for your time and insights, Michal