Mamiya Sekor D 75-150mm & 28mm F-- in camera display
There may still be a number of Mamiya Sekor D 75 - 150 mm lenses, in the field that are not up to date. This lens causes the camera communication to fail with error 06, F--, or the camera hangs. This has been seen on the Mamiya AFD II, AFD III, and the Phase One 645. When replaced with a properly configured lens the problem is solved.