To add onto this - I highly recommend you take advantage of light rooms Flat Filed Correction tool, it will eliminate lens vignetting which can cause issues when inverting. This article elaborates https://www.pixl-latr.com/defeating-the-orange-haze-lightroo...
That looks very useful for use with older lenses. With a modern lens, shouldn't Lightroom be able to apply a precise vignetting correction based on the image metadata and the lens parameters?
