Dunno about the vignetting Michael, all lenses exhibit a falloff in
illumination proportional to cos**4 of angle from the axis (just a result of
the optical physics) so this is a non-negotiable property of the lens.
The Zeiss could also have real vignetting too !
...Wayne
Wayne Harridge
http://lrh.structuregraphs.com/
> -----Original Message-----
> From: Michael Wong [mailto:mialop@xxxxxxxxxxxx]
> Sent: Tuesday, 15 September 2009 7:42 PM
> To: Olympus Camera Discussion
> Subject: Re: [OM] Zeiss 18mm now available for EOS mount - what does
> this mean for OM Zuiko 18mm?
>
> I have no Zeiss 18/3.5 but I saw some samples from my friend.
> Vignetting is
> observability at wide open, F8 and lower speed will be better. As
> Cosina
> Zeiss style, I believe that contrast, color saturation are higher than
> Zuiko's. And, Zeiss one is very sharp with high resolution. Compare
> with
> Zeiss 21/2.8, the quality of edge is poor than 21/2.8 if 100% viewing.
>
> It's seldom to sell used Zeiss 18/3.5 (even ZF mount) in the used
> market,
> cannot compare the price for the used one but the new 18/3.5 is over
> HK$10,000 I think Zuiko's is still attractive. Moreover, as Iwert said,
> the
> size of Zuiko's is much smaller than Zeiss's as 49mm (without adaptor)
> or
> 72mm (with adaptor) vs 82mm filter size.
>
>
> ---
> Michael
>
>
>
>
>
>
> 2009/9/15 Dawid Loubser <dawidl@xxxxxxxxxxx>
>
> > Now that the Zeiss Distagon 18mm f/3.5 is available for EOS mount, I
> > am curious about two things:
> >
> > * How does the Zeiss compare to the OM Zuiko 18mm f/3.5 ?
> > * Do you think there is any chance of the prices of the 18mm dropping
> > because of this?
> >
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