When building mosaics and when doing very wide field photographing it could sometimes be useful to correct the optical distortion.
I try to implement something in the software AstroImageJ were I can do it. There are some plugins but still a bit tricky to get it to work. It's a self learning project/tutorial for myself and maybe others also find it interesting.
Here what I have written down so far:
http://www.astrofriend.eu/astronomy/...istortion.html
It's slowly in progress. The last thing I have done this week is to find the parameters of the optic distortion, page II.
i.e. find a, b and c
r' = a*r + b*r^2 + c*r^3 ...
Correction for rotation symmetric distortion.
There are other software that can do this very easy I think, but I want to do it from the ground to learn more and have more control over it.
/Lars