I bought a cannon ae-1(what is the difference between a ae-1 and a ae-1 program?) that came with a 50 mm lens. Then I bought a 200 mm zoom lens from another person(both ebay) that was supposed to be for this camera. The 50 measures approx 1.75 where it connects to the body and the 200 is just over 1.5. Is there any kind of adapter ring I can purchase to make the zoom work on this camera? Thank you for any and all help.