Damn, so close...

[Farside]

The Pigriff-C of the Novoflex is filling the image circle of the P6 when I hold the camera to the back of the P-C, but it just falls short of being in focus.
I looked at the Novoflex site yesterday and noticed that they do sell a version of the P-C for MedFormat, but it's missing the rear extension and now I see why. I reckon if I can remove the rear sliding piece and make a stub insert from 45mm tube with a P6 mount it will bring the image into focus, since I think it only needs to come forward just a few mm.

If I can make this work it will give me 400mm and 600mm on P6, double that with the TEX 2x telecon.