"NG 10 Years" competition: RESULTS !!!https://nikongear.net/revival/index.php?topic=11252.0Current status: 87/150 supporters
According to the linked page, my 5cm f/1.1 Nikkor-N has a Xenon heritage ....
Have you tried any Xenon-lenses?.....or may Ultron.....but that is another topic :-)https://casualphotophile.com/2019/03/10/xenon-lens-history/Dr. Tronnier seems to be a talented lens designer from that period?