Yeah similar but fixed focus. I talked to Robert Reeves for some advice he wrote Wide-Field Astrophotography and has a good website about the camera.
http://www.robertreeves.com/repair.htm
There was another page which I got may Idea from but it seems to have gone. Your right these do come up ever now and then, they made a 5 and 8 and a 14 inch version would love to get the 14. I have also seen a site that shows you how to mod a meade schimdt-newt which makes to focal plane easy to get at.