This thread is very encouraging. I am motivated to keep my really old manual lenses to be used even on my new D800. My lenses are so old that they are even before AI came along. I just did my own very rough or crude modifications for them to work on the present day cameras. No refinements as I intend to keep these lenses for good, especially after going through this thread. On top of which the MF lenses that I have, 20mmF4, 50mmF2 HC and the ever popular 105mmF2.5 are sharp and produces very good resolution.
Here's a candid shot which I took yesterday afternoon, about 7 metres away, with my 105mmF2.5:
ISO400 F5.6 1/250s
This is my first time posting an image. If it works out nicely I'll share some more.