21mm f/4.5 Biogon om M9

[Beemermark]

Has anyone used this on their M9? Any issues with color shifts?

 

[WJJ3]

This might be of interest to you:

https://themachineplanet.wordpress.com/2014/04/20/zeiss-c-biogon-t-4521-zm-and-removing-the-reds/