Believe it or not, I got this lens from Photo Arsenal US$450 just before the price hike of
Ultra-Micro-NIKKOR lenses which became very famous by Akiyan's RED BOOK NIKKOR.
According to the info, this lens can resolve 500 l/mm (e-line) at the central 12mm circle.
The following shots are all full images from the cameras used, not trimmed nor cropped at all,
and also its image circle cannot cover the full frame when the subject is more than 0.3m away.