Well after 2 1/2 years of looking I've finally found one of these... a 55mm f/1.9 Computar DL enlarger lens, with LOTS of seperation in the rear group. I also have another Computar DL (135mm) with nasty seperation, AND when I found a google archived *bay 55mm computar listing I somehow missed, that one too had seperation. It would seem this whole series of lenses has a problem with this. Focal Point quoted me $200-250 for recementing the rear group. It's probably worth it for this unique lens, but if anyone else is searching for one of these, be advised.