I picked up a well used Omega D2 a while ago...a long while ago. Yesterday, my son goaded me into bringing it in from the garage. We set it up in the bathroom - a feat that I had thought not possible.... Anyway, I was somewhat at a loss as to how the two large condenser lenses are supposed to be arranged (for 4x5). I quickly figured out that they both go in convex side up but, does the thicker one go on top or on bottom? I think I have the thicker one on top right now, and it seems to work but was wondering if anybody knows for sure?