Hello,

I would like to report that I've localized and solved all my problems. 
Problem with fov-focal length correction was due to the use of individual 
crop parameters for each image. In this case PTGui seems to use a default 
crop diameter Dcrop for this conversion. As far as I understood, it's the 
value which binds theoretical fov to theoretical focal length.

Moreover, I found that my problems with radial correction were connected to 
the incorrect fov estimation, as it is only the PTGui interface which 
calculates f from fov as stated above, but for radial distortion correction 
one should use the value calculated from equidistant projection.

Also, I found out that the polynomial in the forward direction should be 
used in projection, and solving the polynomial equation - in backprojection 
procedure.

In all the rest my statements were OK.

I'll just leave it here for next generation of developers :)

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