The Mamiya lenses will fit all the way up to the current 645 Auto focus model, albiet in manual focus mode, but they will still fit and work, other than convienence the newer models will still be heavy when fully configured for use, I currently own the 1000s and recently rented the AFD and other than the auto focus, which I am not trusting of, I really did not find it any different that using my 1000s, I also have a Model J and have owned a couple of Pros in the past, the Mamiya 645 series is one of the work horses of the industry and has been around for many years and still going strong.

For the extra substantial cost, I am staying with my 645, if you want metering, the PIS prisim finder is not all that expensive and are quite easy to come by.

Dave Parker
Ground Glass Specialties