Mark Norton
Well-known
From the picture on the Leica forum, the coding consists of 6 patches milled into the back of the lens mount and filled with black or white paint, so resistant to wear of mounting and dismounting the lens, not affected by damp or dirt, providing you keep the window of the sensor clean.
The same picture suggests the dots are located at 5 "o'clock" on the lens mount, as viewed from the front.
The same picture suggests the dots are located at 5 "o'clock" on the lens mount, as viewed from the front.