kevin m
Veteran
Another consideration with the v4 Summicron is that of all Leica M lenses it has probably the highest incidence of mechanical problems.
I've not heard of this... Care to elaborate?
It's pretty widely known that the lens has a tendency to unscrew itself. If you handle the lens on a body and the front half seems to "wiggle," then the lens group is coming unscrewed from the focus mount. It's held together with a large lock ring that's secured with glue at the factory. The glue fails with age and the lock nut backs off. I had mine apart a couple of times to tighten it up.