i tested the 612-version with mamyia-press-mount. it is of a bad make. we could even not correct/repair film-flatness good enough. you will never get 100% perfectly sharp images.
my repairman-the one who also repaired my widelux 1500(BTW FROM ADORAMA/PANON-camera 1 had to be exchanged by the latter...without success)- has made a shiftadapter for tomiyama 617.