Not sure if you are still looking but I have an ISCO III and a "once working" theater-scope sled from DPI. Thinking of going in a dif direction aspect ratio wise so I might be interested in selling the lens. The sled is somewhere around since I was initially going to attempt to trouble shoot it. It's probably on my workbench in the garage but the the lens is sitting in front of my projector and works likes a champ. I bought it brand new several years ago with my DPI system.