[filmscanners] Re: Avoiding Newton rings

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

As Laurie suggested, there are trade-offs.  I know it is/was used in the
printing trade, but they use large films, so the magnification may be
very low, or even 1:1, where it probably wouldn't show up.  In the case
of a small frame being enlarged considerably, it may indeed degrade the
result.

Perhaps someone here has tried it and can report.

Art

Brian wrote:

>>One way that this has been dealt with is by using a glass which has a
>>very fine etched surface which creates very small "contact points"
>>between the two surfaces.  Another method is to use a very fine powder
>>(talc is sometimes used) to again create this "airpace" with minimal
>>contact points.
>>
>
> I have read about the fine powder technique before. But wouldn't this
> degrade the scanned image (kind of act like dust particles)?
>
> Brian P.
> --------------------------------------------------------------
> Remove 'nspm' from email address and
> respond to bdplikaytis@bellsouth.net
>


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