Dudemeister,

I am fairly new to this myself. I would say that in turn table mode the cameras have been set to an optimum distance for the stated envelope of the scanner so unless the cameras use autofocus in this mode then some part of you object will be out of focus when scanning. In free scan mode you are free to use the cross hairs to judge the focus of the object (or the feature that I posted about recently) to scan.

Have you compared quality of scans from both modes?

I would fire this question to shining3d support directly.