okay, I had a second look into it, using Top cam to (pre)view the scene, while having the Main cam selected and visible.

The Main cam is (sort of) parented to an invisible and inaccessibe "main cam helper" object at 0,0,0. Sort of, because actually it's parented to universe which cannot be rotated or alike.

When using xyzOrbit you're actually rotating this parent/helper and the main cam child moves and rotates through the scene accordingly.

When using DollyXYZ you're moving the Main cam relative to it's parent, without rotating. When DollyXYZ=0,0,0  the Main cam is located at XYZ= 0, 0, 1.1 in Poser Native Units

In the meantime, main cam still has the ability to rotate with respect to it's own axes, but there is no dial to make it so directly. You can use the PointAt function instead.  

Note that Aux, Main and Pose cams are meant for helping you building and exploring the scene. Actual shooting is best done using a Dolly cam, as these move freely around, and behave more understandable, especially in animations.

 

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though