I'm new to spherical panos- primarily using them for work with the US Forest Service. I just purchased an RS-1 for my Canon Rebel with a lens ring for a Canon EF 8-15mm fisheye zoom. I'm having difficulty fitting the ring around the lens. Perhaps I do not have the correct lens ring? Perhaps I do not have the best Ninja set up for my camera?
I've attached a pic of the lens and lens ring for reference. On what part of the lens does this ring connect to?