Just a quick post to carry across the information from the "Focal Length Value For An Exact 90 Degree FOV ?" thread

An exact 12.7mm focal length provides an exact 90° FOV for the dolly camera with all it's scaling values set to 100%.

This 12.7mm figure also seems to provide an exact 90° FOV for the Main and Aux cameras (I ran into problems doing the tests with the Posing/Face/Hand cameras so unable to comment on those)

The actual camera position for the Main/Aux cameras seems to be almost exactly 113.52" along the positive Z axis from the DollyX/Y/Z coordinates.

The OrbitX/Y/Z seem to work as in the image below (I think this corresponds to what aRtBee says in the post above).

With the Posing/Face/Hand cameras I believe that the Hip/Head/Hand position is used instead of the world origin.

(Of course if you set 'Point At' for any of the cameras that changes things - not sure of the details yet)

Note: I've been getting some situations where the Main camera seems to orbit a point other than than the world origin WITHOUT 'Point At' being set. I get a vague idea that the centre of orbit is somewhere approximating the midpoint of all the props/figures in the scene - but that's just a feeling...

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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