Yeah, I often do the calibrations in Python (OpenCV for distortions and rawpy and a flat frame for vignetting), spit out a tiff, and then do the rest in darktab

Yeah, I often do the calibrations in Python (OpenCV for distortions and rawpy and a flat frame for vignetting), spit out a tiff, and then do the rest in darktable. Lensfun is complicated so I never tried to go through that. Libraries are supposed to simplify things and it doesn't.