Quote Originally Posted by John Koehrer View Post
spring or oil wandering around in there.
Does the stop down lever on the lens return to it's start position? That's the only spring that controls the aperture..
If the lever returns, it's likely that it's oil in the diaphragm housing.

In either case, it's not a difficult job for a technician.

The stop down lever is the square black lever sticking out the rear of the mount.
It's definitely a spring. I didn't see it last night when I looked, but I was looking at it earlier and it looks like there is some oil on the blades. Hopefully, it won't cost too much. I guess I'll check around at a few local shops and maybe some in Atlanta.