Andrew's guide is absolutely fantastic. I got my hands on this huge Kollmorgen-Kosaka 298 before I bought the EOSHD Anamorphic guide, and I had to frankenstein a way to make it work; this is what i ended up with, and it works decent. The front of the M42 Yashica Yashinon / Vivitar lens matches within 1-2 mm the back diameter of the Kollmorgen anamorphic lens, so I can use full zoom range with no corner artifacts.
[img]http://www.eoshd.com/comments/uploads/inline/21053/503da498aa33d_S1370018.jpg[/img]