Steve, the #1 standard (Compur/Copal/Prontor/Seiko) front tube is threaded M40x0.75; the rear tube is threaded M36x0.75. Tube length is 20 mm. #1 press shutters' front of tube to iris distance is 11.7 mm. #1 cock and shoot shutters' front of tube to iris distance is 10.75 mm. Design away, if the lens will fit at all.