Hi, I just bought a M 28/2.8. It is very sharp but lacks some constrast, and blown lights «contaminate» other parts. Here is a crop in a comparison I made between the M28 (left) and the DAL 18-55 (right):
There seems to be haze on inside lenses and I thought it would be good to open the lens to clean it.
But I couldn't go further than removing the focusing ring. It looks like that (without the ring):
I unsuccessfluly tried to turn the center parts with a metallic tool (and I didn't want to broke the lens…). some screws and a ring were glued, I wonder if it is the same for these parts. So do you know how to disassemble the lens further? Or it is a bad idea to do that?