In article <32B2E0CB.17C3@po.cwru.edu>, dga2@po.cwru.edu says...
>Niklas Nikitin wrote:

>> Which one of three followin Nikkor lenses should I choose:
>> * 20/3.5 AI US$ 450, Second hand in good shape
>> * 20/2.8 AIS US$ 600, Second hand in good shape
>> * 20/2.8 AFD US$ 750, Demo product (almost new)
>> Please send me any comment regarding there optical/mecanical qualites.

>The 20mm AF is a little on the fragile side for a Nikkor lens.
>Otherwise, it's an excellent optic. The 20mm AIS is, I believe, the
>same optical formula, but is definitely sturdier.
>I've not heard good things about the 20mm f/3.5, but you might want to
>check David Ruether's Subjective Lens Evaluations for a capsule review.
>URL's for this article can ususally be found in this newsgroup and in
>rec.photo.misc.

Actually, Niklas carries a copy of "SLE" on his web page...;-)
BTW, this is always fun: enter "d_ruether@hotmail.com" (with quote marks)
in the www.altavista.digital.com site in both the usenet and web
catagories.... (the "SLE" article comes up first in the web search).
Hope This Helps