> I can do the lens correction with ufraw manually, but there
> are three
> parameters, and it is hard to figure out how to adjust them
> visually.

After a very quick googling I landed here:

As far as I can understand, this is the model used by UFRaw.

You might calibrate the parameters for each of your lenses with the aid
of the model and some reference image (e.g. you can print a grid
on paper and take a photo with your lenses, setting the zooms at
significant positions like max wide/max tele/center).

Then you can guess the parameters by analyzing the correction formula,
or you can even write a distortion measure and minimize it analytically
- I am sure you have the necessary background to do that, and it can
even be fun to do it.

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