Quote Originally Posted by Mark Crabtree View Post
Which Summicron? I have to take my 8 element 35 apart every once in a while to clean out a very slight haze that builds up. It is straightforward, but there are a couple shims to make note of. I seem to recall that the 6 element 35 was very simple. The 50 DR is also straightforward as best I remember, I haven't had any reason to take my newer 50 apart so don't know much about that.
Hey Mark, it's a summicron 35 v4. The latest one before ASPH.

Basically oil has seeped out past the blades and onto the inside of the rear group.