“0x0801 appears to be the vignetting correction. It looks like a spline, always starts around 8192 and increases monotonically.
I have a Panasonic lens which doesn’t get any vignetting correction by the camera body and has an almost null 0x0801 tag - it is always 8192, 8193, 8194, … , 8207, 8208.”
That seems like Canon. I recognize the numbers Manufacturer lens correction module for Darktable - #75 by Peter
Canon Lens Correction data - Google Tabellen