This isn't about correcting for minor imperfections, but converting the image from the wrong kind of lens. See https://m.youtube.com/watch?v=6toiNmZ_e4I https:

This isn't about correcting for minor imperfections, but converting the image from the wrong kind of lens. See https://m.youtube.com/watch?v=6toiNmZ_e4I https://m.youtube.com/watch?v=6toiNmZ_e4I for the difference.