>| I have never used one, but every one of the few photos that I have seen
>| taken with this very old design (including one in the Contax literature)
>| has been soft in the corners..... (Warning, this is NOT a definitive
>| evaluation of this lens! ;-)
>| Hope This Helps

>Probably not as soft, though, as the Vivitar 19mm that I currently use :^)
>Bob

Hi-- Probably not - and I don't know if optimum apertures were used in the photos I saw, but the one in an old Contax ad was shot outdoors and printed
very small, and it still looked bad in the corners.... (Try a Nikkor 18 or
especially the only-slightly-longer 20mm at f5.6 and smaller to see what
can be done with this focal-length [recent lenses only - the pre-f2.8 20's
and pre-f3.5 18 Nikkors are also not wonderful];-) David Ruether