What I heard was SD9 has no low pass filter, I think the lenses design for
smaller sensor should have higher resolution.
C.H.Ling
> -----Original Message-----
>
>
> I believe someone posted a review of the Sigma SD9 showing very
> pronounced aliasing ... looked like resolution beyond the Nyquist limit
> but the number of lines in the image changed.
>
> Although this link doesn't look as pronounced as the one I vaguely
> remember it talks about it and shows it.
> http://www.dpreview.com/reviews/sigmasd9/page23.asp
>
> Perhaps the Sigma has a better lens than the OM Zuikos, thus Olympus had
> to improve theirs.
>
> I hope it's more that Olympus wants to be ready for even better sensors
> and the current technology makes it so they can build better yet cost
> effective lenses, relying on a low pass filter to eliminate colorful
> Moiré patterns.
>
> -jeff
>
>
>
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