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[filmscanners] Re: Nikon Super Coolscan 4000ED and sharpness/focus
As Kennedy has been discussing, some defocusing may not be a defect, but
a way to lessen aliasing of high frequency detail. Most 4000 dpi
scanners probably do not need to defocus much to prevent aliasing, but
the Nikon may need a bit more due to the lighting type.
Art
al@greenspace.freeserve.co.uk wrote:
> Gary Richardson wrote:
>
>
>>I've got the Nikon Super Coolscan 4000ED. When I'm scanning a slide I'm
>>finding that it's somewhat out of focus (or better stated, not
>>sharp)... I was getting sharper
>>scans out of my old HP Photosmart scanner.
>>
>
> A low-tech (but effective solution) suggested by Tony is to score a cross
>into the emulsion of some
> blank film with a scalpel blade, focus on the cross and scan it at full
>resolution. That should make it
> clear whether the scanner has a problem or not.
>
>
>
>
> Al Bond
>
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