Thanks, looking forward to see your results and impressions. This Nikon lens is particularly interesting to me, since I already have a Novoflex adaptor for my 24 f2.8 AIS.
The 20mm lens would allow me to go a bit wider, especially for astro-landscapes, where some reports say it is not bad.
I know that with Nikon G lenses, the aperture is selected via the ring on my adaptor, hence, no accurate reading, but I would most likely set the ring in the middle, at around f11 or f8. No big deal.
Again, thanks.