Nikkor 18 or 20 AIs

[kaiser]

Anyone have any experience with the any of the following?:
Nikkor 20mm 3.5 AI/AIS
Nikkor 20mm 2.8 AIS
Nikkor 18mm 3.5 AIS
Voigtlander Color Skopar 20mm 3.5 SLII

I was looking for something wider than my 24, but something small and light and relatively cheap and these seem to fit the bill. Will be using them stopped down and on tripod so speed, AF and wide open performance is not a major concern for me with this purchase.

[I @ M]

I have no personal experience of them but I reckon Bjorn makes quite a bit of sense with his ratings on Nikon lenses.

http://www.naturfotograf.com/lens_wide.html