That's not a shadow of the rings on the globe. That's called the Crep Ring. Look at the pictures. It's a dark ring inside the other 2 rings. It's always visible aginst the globe. On a good night you can see it aginst the dark sky on the inside of the rings. Check it out. Sometimes, you can see the shadow of the globe on the rings, that's real cool! Sorry, can't help you with your photography question.
That's it;
BOB SAL