Actually Clive, while pursuing your lead I found variants and developments of the software that look very helpful and I have installed a plug in called PTLens that looks as though it may solve my problem. It uses a data base for specific corrections to particular cameras and lenses (Like Dx0). It's freeware, but I have made a small donation because I want to support the development of the data base. You can find it here if you are interested. Thanks for the lead . . . . .