[filmscanners] Re: Why DSLR ouput looks sharper?

["Berry Ives" <yvesberia@earthlink.net>]

on 9/12/03 5:00 PM, Paul D. DeRocco at pderocco@ix.netcom.com wrote:

>> -----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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Sigma sent me their demo disk.  I printed an image of a flower taken with
the Sigma Fovion.  At 8x12, it looks terrific.  Of course, there are no
straight lines in it.

At 12.5 x 18.5", it is still quite nice, though it is less sharp.  Of
course, printing 12x18 from a 35mm neg is going to show some significant
loss of sharpness too.  One reviewer of the Sigma thought there might be
some clipping of highlights going on, if I understood him correctly.  Forgot
where that review was.

I notice that there have been no comments at all on the new Olympus E-1
DSLR.  I guess it is too early for folks to have any experience with it.
They have an interesting take on digital, that the light hitting the chip
should be coming in perpendicularly, and not obliquely:  film grain is fine
with oblique light, but chips are not, they say.  So they built the camera
"from the ground up" as they said, optimized for digital and not trying to
use 35mm lenses.  Anyone bought it yet?

Berry

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