In article <5c07b9$n8h@matrix.mdn.com>, daehler@holycow.mdn.com says...

>Has anyone any experience with the Tamron 20-40 f2.7-3.5 AF lens? I am consid
>ering it or the Nikon 20mm f2.8 AF prime to be used primarily for landscape ph
>otography. I shoot primarily slide film (50-200 ISO) and occasionally make en
>largements to 16x20. The Nikon costs somewhat less than the Tamron and I wond
>er if the versatility of the Tamron would outweigh the difference in cost ($25
>0) and possible loss in optical performance.I would appreciate comments on eit
>her lens, particularly on any experiences with the Tamron.

Even if the Tamron were the best wide-angle zoom I have ever seen
(and I do really doubt that it is...), it would be VERY hard for it
to come close to the really excellent performance of the 20mm f2.8
Nikkor at f5.6 and smaller stops - even Nikkor's own very expensive
20-35mm zoom at 20mm probably doesn't equal the prime... I think there
is no contest, if image quality is more important than zooming (which
I would guess it would be, for landscapes...).
Hope This Helps