This is in correspondence with my last post.
I had a 75mm Five Star Macro lens that came with the camera. It was a zoom lens. While I was zooming out, the lens came apart into two pieces in my hand. It sounds like there is a ring loose in it. I tried to screw it back on, but it did not work.
The lens is still in two pieces. I'm wondering if anybody here knows something about it, if this is common, or if I should just buy a new one.