[filmscanners] Re:Using dICE with glass carriers (was: Depth of Focus)

["Arthur Entlich" <artistic-1@shaw.ca>]

As has been discussed by myself and others in previous postings, a glass
carrier has other problems.  Glass is not always optically pure either
in color or it transmission, and it adds 4 other surfaced to keep clean.

However, this raises another issue as well, that perhaps Jack from ASF
can address.

Is there any effect upon the use of dICE with a glass carrier?  Also, if
there is dust, dirt, scratches on the outer glass surfaces, can dICE
effectively remove these problems?

Art

Jeremy Nicholl wrote:


>
> It's a combination of all of the above. The 4000ED light source
> apparently requires a wide aperture = limited DOF. Combine that with
> the film holder's inability to keep the film flat enough and the
> result is scans which lack edge to edge sharpness. The problem
> doesn't exist on the Polaroid 4000 because its light source is
> sufficient for a smaller aperture = greater DOF, meaning that even
> though the Polaroid film holder is far from impressive scans are
> sharp unless the film is noticeably warped.
>
> I suppose the solution would be for Nikon to produce a glass film
> carrier similar to that which they make for the 8000ED. However they
> may not wish to do so since that would in itself be an admission of
> the problem.
>
> Jeremy Nicholl
> --


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