M.J.Shupe wrote:
> I have an important question however. Photodo reports 2% field
> curvature. Is curvature evident on your 20/2.8 (not in comparison to
> the zoom--in comparison to things you know are straight, like buildings,
> trees, whatever)?
It's 2% distortion, field curvature is something different. Anyway, 2%
distortion IS visible on very critical scenes with long, absolutely
straight lines next to the edges of the frame. I have done such pictures
for test purposes, but never had bent lines jump out on me in real world
pictures taken with the 20mm.
>
> Thanks for your help. Unfortunately, I cannot "try the lenses out for
> myself," since I am in podunk town USA and there are no decent camera
> shops here, not to mention it would require not just a decent shop, but
> an excellent shop to have both the Canon lens and the Contax lens in stock.
Well, I expect the Contax to be a little sharper, but the Canon is sure
sharp enough. Outside the test laboratory the difference may not
matter. I never had to trash a picture yet because this lens wasn't up
to the task. Even the zooms are well regarded lenses. George Lepp sings
their praise in his book on EOS lenses. I don't know how independant he
really is, though. ;-)
Thomas Bantel
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