Quote Originally Posted by Sal Santamaura View Post
...Since 120 and 210 AM-ED are described as taking lenses in the Nikon booklets I have, and given that their coverage is specified at small apertures like the other taking lenses in those booklets, I assume (always a bad idea) their optical design was also calculated for use at f/16-22...
I just came upon this page

in which Bjørn Rørslett reports his results with the 120. The relevant quote is:

"At f/8-f/11, the image across the frame is very good and at f/16-f/22, image quality is outstanding."