I have a Sony Alpha100 (old, I know). And I recently purchased a Vivitar 13mm Ultra Wide Aspherical Lens (f/2.8 ) for Sony. When I attached it to my camera, it didn't work, kept getting a message that said "No lens attached". I've looked on various sites and none have given me a definitive answer. I cannot find the specific adapter that I need to resolve this issue. Any suggestions?