The lens distortion parameters of any particular lens @ focal length x are also dependent on the camera sensor dimensions. Lists of distortion parameters are derived from specific lens/sensor combinations (without specifying the sensor characteristics).
I would strongly suggest that photographers determine these parameters themselves, for their own particular setup. A simple approach is to set up a single row of suitable 50% overlapping shots, CP and stitch then save the lens info. The lens info file is simple text that can be easily edited, to add x and y shifts, for example. Take especial care to ensure that the camera is mounted very close to a right angel to the axis of rotation and that parallax is eliminated beforehand. Work progressively; start by working out a reasonable FoV, from a prior stitch, to use as a starting value, but allow it to optimise. After the distortion parameters have been determined, work on the x and y shifts; first one then the other. Happy New Year folks. http://panavista.eu/
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