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I got this manual thorium radioactive lens way back. I think it is a 1.4 50.
I read about how the thing causes people trouble meaning the mount.
So, I locktite the adapter ring to the k mount.
I let it dry.
I can not get the lens out of my camera now.
BTW, the test pic, on a K200......without knowing any settings or manual stuff beyond a skim here
is beyond belief.
I bought a K-5IIs and didn't tell anybody here (trying to learn it).
I have a DA50 1.8.
I can not even explain what this lens is like.
I think it is a 1.4 50 thorium glass manual.
The practice photo was like nothing I have ever seen.
But I can't get the lens out of the K200.