To get the ball rolling - back in 2014 at various points in those two threads....

Ockham's post from the first thread suggests (with a caveat) the *{the forum once again deleted my URL link)* (which no longer seems to appear on the main Python page,although there area couple of other camera-related scripts)

bagginsbill suggested simply asking poser where the camera is as the key to it - poser.Scene().CurrentCamera().WorldDisplacement()

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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).