Thanks for that
I just tried PT Lens, and it worked very nicely. It recognised my Sigma 10-20mm lens and corrected for it. I'm not sure how the correction compares with DxO stuff - a fair bit of cropping was done, which sort of negates part of the advantage of using a wide-angle lens.
I seem to recall seeing a couple of examples of the DxO corrections that fix the distortion without doing much cropping - can anyone confirm this?
Anyway - PT Lens worked well enough to justify $15, so I just purchased a license.
When, or if, DxO get their act together and recognise that the Pentax K10D is quite a popular camera, and also introduce profiles for lenses such as the Sigma 10-20, then I might consider buying DxO. Until then, PT Lens will do the job methinks
Thanks for pointing in that direction.