Hello,
I have put a 25mm/F:4 Voigtlander lens on my 262, which is, without video, the same sensor as the LeicaM240;
At first I had terrible results in fringing and magenta issues.
Then I set the profile at :28mm/F:2.8 ASPh and BINGO!
I am getting great pictures (probably a compromise between the 25 and 28mm frame), no fringing, almost no magenta issues.
Try it and see !
Best
xtual