Quote Originally Posted by Bill Burk View Post
This one is, ...
Do you mean your lens is an enlarging lens? Can you please explain, ie what makes your lens an enlarging lens instead of a taking lens?

The Xenar (and similar taking lenses such as Xenotars) where available as a barrel lens, ie without shutters. They look just like enlarging lenses.

This is my Xenar 100/3.5, which certainly looks like an enlarging lens.