Posted - Mar 18 2018 : 2:40:24 PM Why do you think there isn't any diaphragme? On the photos, it looks like there are two rings.
xalmaz
Posted - Mar 13 2018 : 11:25:38 PM If no diaphragm, it's a cine-projection lens, can be J-48,J-25, and any other projection lens. Hand-made adopted on M39/M42. Now many OKS adopted on M42 presented on market, not cheap.
Posted - Mar 13 2018 : 5:46:23 PM but has no diaphragm at all! Regards LP
Moxies
Posted - Mar 13 2018 : 4:11:02 PM It's a J-48 or J-25 100/2, quite rare (and expensive!!) cine lens before OKS era. Those lenses were made by GOMZ, and give great image quality.