Hi Les. What you say about the Main/Aux camera position strengthens my suspicion that the exact distance is undocumented.

But "The center of their orbit is this point 1.1 PNU in front of the position indicated on the DollyZ dial." ?? That doesn't sound right - that's where the camera is! And the main/aux cameras clearly orbit around an external point.

My tests so far seem to indicate that the centre of orbit is actually the world origin (as stated in the Manual!) - so if you rotate +90deg YOrbit the camera will be 1.1 PNU along the positive...and then the resulting point is offset by the DollyX/Y/Z.

I need to do some more tests when I'm back on my own system, but this seems to make some sense.

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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 or something else.
*soon only to be available in two flavours -  DAZ and Renderosity