Voigtlander Super-Wide Heliar 15mm f4.5 ASPH M39 on Leica M 240
Just share an experience of using this combo which always trouble with strong red edge but with LR plugin name DNG Flat Field, the problem solved. Enjoin the very wide views.
original RAW
The DNG material for Flat field plugin
after Flat field plugin Color only
after plugin then correct CA and a bit of vignette