Omega 39mm Enlarger Lens Retaining Ring

Metal 39mm lens retaining ring (jam nut, lock ring) to fit all Leica thread (39mm x 26tpi) enlarging lenses. It's important to note that this 39mm retaining ring supplied by Omega has an outside diameter of 45.5mm and can be used with all Omega enlargers, turrets and lens mounts. Other rings may be too large to fit properly.