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[filmscanners] RE: Why DSLR ouput looks sharper?



> -----Original Message-----
> From: Arthur Entlich
>
> I just took a look at the image you directed me to.  But I didn't stop
> there, because without a comparison it doesn't mean a lot.  Is the
> defect due to the jpegging, is it the limit of a digital sensor, or the
> resolution?  I couldn't tell.  So I went to another digital review site
> www.imaging-resource.com, and I used the "Comparometer", and took a look
> at the image of the house and the musicians, both which contain numerous
> angular lines within them.
>
> I used the Canon D30, since it has a similar resolution, and I was
> unable to see anything drastically difference between them in terms of
> this particular defect.  I was somewhat surprised by the red/green color
> "fringing" on the Sigma, however, but that may have more to do with the
> lens, or even the software.

The red/green fringing in the original image is clearly chromatic aberration
in the lens, because it is prevalent near the edges of the picture and not
in the middle.

This image is quite a bit sharper than anything I can get with my 10D.
However, that I assume is due to the diffuser over the sensor, since I'm
sure my 17-40mm L lens isn't the limiting factor. Too bad the diffuser can't
be flipped in and out, since the extra sharpness would be nice in situations
where moire isn't an issue. I think this particular test image (the
Nicholson St. building) looks really good.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

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