Hey All-- So I've acquired a Black Magic Pocket Cam, which has allowed me to dust off all of my old C-Mount lenses and put them to good use. My Kern 75mm f/2.8, however, seems to be acting strange. The C mount can now become unscrewed, which I don't remember it being able to do before-- see photo attached.
I don't think that this part of the lens should be able to detach completely from the camera mount. It basically comes right off of the focusing threads. Any insights about this would be greatly appreciated-- I know I haven't explained the situation in the best way, but hopefully the photo will help.