[rwh86]

It's an open source tool. If you'd like support to be added for your camera, take a look at this page:

https://www.darktable.org/2012/10/whats-involved-with-adding...

The lens correction comes from the lensfun project, which is also open source. They even run a lens calibration service if you submit the necessary images:

http://lensfun.sourceforge.net/

A lot of distributions have ancient versions of lensfun for some reason, so upgrading can make a big difference. They're currently working on splitting the lens definition file into a separate package from the software so that it can be updated more frequently.

If you have any questions for the developers you can always jump on to #darktable on freenode IRC. darktable 2.0 has just entered feature freeze.

[sandGorgon]

I think darktable should have a single click button to be able to submit a lens calibration (which might get redirected to the lensfun API). Most people are highly uncomfortable going through all the trouble.