Forgot how much Mongo loved his 105 mm f2.5 and AF 180 mm f2.8 ED (new) in the film days. Still own both but they have lost some of their prominence in these digital days given the 70-200mm f2.8VR
I really like my 24-105 f/3.5-4.5 AFD. It cost me next to nothing, but is a great portrait lens on the D500.You mean 28-105/ 3.5-4.5 AFD my favorite lens in the age of film
Fixing a broken return spring for the aperture is quite an easy fix,,,, either follow one of Richards guides or hand it over to a repairman. ;)