<p>I've acquired a set of 3 process lenses , 210 f6.3, 152 f4.5 and 105mm. f4.5 identified only as "SOL. UK".<br>
The mount thread is about 45mm. and they are screwed into adapters with a screw thread of about 75mm.<br>
If anyone thinks photographs will help I will add some.</p>