For camera bodies I use two ELX's, many many years old and still working perfectly. My bellows, though, is showing its age after over 20,000 photographs, and will have to be replaced soon. A 553 ELX would be necessary if I intend to use the Dicomed back. My trusty ELX's are not modern enough to handle a digital back. My Zeiss lenses are also rather ancient.
None have floating lens elements.
For a viewer I need the Meter prism PME 51 since there are times out in the jungle I need to shoot on the spot, and do not have time to bring a Minolta meter into action. My Hasselblad projector accepts only American current. Since I speak German and am often asked to lecture in Switzerland, Austria, and Germany, it would help to have a Hasselblad projector which runs on 220 current so I can introduce audiences throughout Europe to Hasselblad and Zeiss quality. In 1970 the F.L.A.A.R. Photo Archive evolved past 35mm photography to enter the realm of medium format. In 1994, funded from Japan, it was possible to move to 4x5 inch format.