Flat-Field Correction

This feature is now built directly into Lightroom Classic following the v8.3 update. It’s a specialist tool to address vignetting and color fringing seen with certain lenses.

“The standard way to fix shading is with a calibration photo. While taking a regular photo, you can also shoot a reference or calibration frame with the same optical set-up, at the same time. You can then use Flat-Field Correction in Lightroom Classic to automatically detect and analyze the calibration frame and remove the light falloff and color cast from the corresponding photo or batch of photos”

N.B. your original raw file is replaced in the catalog with a corrected DNG file although your original remains on disc. I think it would have been a better design to stack the new DNG and original together.

If your original raw file is already in the DNG format the replacement DNG will have -2 appended to the file name.

 

This feature is accessed from the Lightroom Classic Library after selecting thumbnails and the reference thumbnail. 

Choose Library >> Flat-Field Correction

See this Adobe help document for full details:

Using Flat-Field Correction

The following link has an in-depth appraisal of Flat-Filed Correction, written by respected reviewer Sean Reid.

Reid Reviews