milidevil.blogg.se - Darktable lens correction

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If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort". Clicking the circular arrow button to the right of the "scale" slider will auto-adjust the scale to the largest crop with no blank pixels. Now, when you change the value in the "mm" dropdown menu, you should get different degrees of generic "defishing" start at the largest mm values and work down the list until you find something that looks closest to correct.

For the lens dropdown: Select Generic -> Rectilinear 10-1000mm f/1.0.

Click on the top (camera) dropdown list and select Generic -> Crop-factor 1.0 (Full Frame).

The following is a dirty hack that may be useful in cases where the barrel distortion at the wide end of a zoom is so strong that even "incorrect" correction might be an improvement. Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for.