My comments, questions and enhancements

[thp]

>Therefore I prefer to compute the actual FOV from fitting a 360 deg
>pano, as this is the important value for stitching.
>Ideally you do this for all lenses / focal length settings and store
>them in a library (together with the distortion parameters, of course).
>
Seems to be whole lot of work! Then again the question is where to store 
those parameters? At the moment I do not have these correct values for 
all focal length settings, but I do know, that for my wide angle 7.13 mm 
the focal length should be 34 mm.

BR
--Thomas