Nikon 50mm 1.4G AFS and 20mm 2.8AIS about lensfun

[bronger]

Thank you for your contribution! Did you put control points on straight lines in Hugin, or did you do a 360° panorama?

Original comment by: bronger

[bronger]

According to http://wilson.bronger.org/lensfun_coverage.html, there is already the 50mm in the database, but with a bigger crop factor, so your contribution is welcomed.

Original comment by: bronger

[bronger]

I took raw photos of a skyscraper and manually added control points on straight lines. Hugin displays only 3 or 4 digits, so I took the parameters directly from inside the .pto file.

I've tested the corrected distortion on different images. After correction in Darktable, I don't see any more distortion, including in the corners. So for my lenses, the correction is perfect.

The TCA correction is also good, but not perfect on the 20mm lens at 100% or 200%. I'm not sure yet if it's a problem with ptlens model or darktable interpolation/demosaicing...

I'm also working on the vignetting correction, but no good results so far.

Original comment by: nlann

[bronger]

It must be a very recent addition, I don't have it in the source I got on
05/04. I will update, thanks.

Original comment by: nlann

[bronger]

As for the vignetting correction, I recommend my method at http://wilson.bronger.org/lens_calibration_tutorial/#id3.

Original comment by: bronger

[bronger]

I pushed your contributions to the git master and close this ticket now. Thank you again!

Original comment by: bronger

[bronger]

• status: open --> accepted

Original comment by: bronger

[bronger]

• status: accepted --> closed

Original comment by: bronger

[bronger]

• status: closed --> implemented

Original comment by: bronger