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Quandary about distortion correction.


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leonardevens Gold Member Nikonian since 22nd May 2011
Sat 30-Mar-13 07:31 PM

I've been working under Fedora Linux, using the program darktable to process NEF files created by my Nikon D90 and a Nikkor 18-200 mm lens and a Sigma 10-20 mm lens. It has a distortion correction module which works reasonably well.

But when I try to use it with my D800 files, although it claims to know which camera and lens I have, it doesn't do any correction. I think this is because the Lensfun database my version of darktable is using recognizes neither the camera nor the 24-70 mm lens.

So I have a couple of questions.

First, do any of you use Linux and darktable with the D800, and have you noticed the same thing.

Second, it seems, so far at least, that my D800 images don't need much distortion correction, if any. Thom Hogan's D800 book says that auto distortion correction works for NEF files only when images are displayed or converted by Nikon View NX2 or Capture NX2. But I am using darktable. So what is going on?

Leonard Evens
Professor Emeritus, Department of Mathematics, Northwestern University