Hello I tried to find a Christie Roadster HD20K-J, but it dont exist in the library, so i take a HD14K-M, but i can't find a slider for the intensity and shutter, so impossible to get a picture. After i tried with a HD+30K, it work at the beginning, but if i change the lens, impossible to get a picture. So, how does it work to get picture from a video projector, and is it possible to add the roadster HD20K-J Thanks