When I updated to a DSLR a while back, I was able to put back into service most of my old lenses. Sure, they were all manual, but they worked — well, all but one. My 30-year-old Nikon 50mm f/1.4 AI-S lens suffered from a problem all too common for this lens: diaphragm lubricating oil smearing onto the aperture blades causing them to stick together. I dove into the Internet and found several sites providing instructions on how to fix this relatively easy problem. Since the repair looked pretty simple, and the lens was toast anyway, I decided to see if I could bring it back to usable condition.