P.S. - it's not just a case of adding/subtracting the x/y/zOffset to/from (x0,y0,z0) or (xc,yc,zc), or adding to the former and subtracting from the latter,or vice versa... I just tried all of those.

I'm rather puzzled by what this x/y/zOffset represents. With the X/Y/Z Dolly/Orbit values set to zero and Michael 3 loaded and zeroed here's the values I ge in X,Y,Z order for the four cameras:

Pose: 0.0, -0.088, 0.0

Face: 0.0, 0.028, 0.0

R Hand: -0.017, -0.006, 0.0

L Hand: 0.017, -0.006, 0.0

*Any ideas?

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).