I just obtained a Schneider Componon 100mm, F5.6 enlarging lens. Assumed (my bad) that it would be a 39mm mount. Turns out it measures 32.5mm at the threads. Does 32.5 sound right? :confused: If so, I need a lens mount and a retaining ring (Omega D5). Alas, the cost of another retaining ring and lens mount will mitigate the "bargain" price of the lens somewhat. :rolleyes: David PS: Already emailed KHB and Classic Enlargers.