Re: Slide duplication

[P3D Greg Erker <erker@xxxxxxxxxxxxxx>]

George wrote:

>Why is it that the copy is never as good as the original?... In my bright
>Realist viewer the difference is like day and night... What exactly is the
>problem?  The copy can match the colors, etc., but it does not have the
>"snap" of the original.  What is missing?  This difference can only be seen

  Let me try.

  The resolution (or sharpness) of the original slide is a function
of the resolution of the camera and the resolution of the film. I.E.
lower than the lowest of the two.

  The resolution of the copy will be a function of the resolution
of the original, the resolution of the copy lens, and the resolution
of the copy film.  I.E. lower than the lowest of the three.

  So unless the copy lens and copy films have way more resolution
than the original slide the copy slide will have lower resolution
(or sharpness).

  Since the sharpness of the edges is a large part of seeing
the 3D in a slide, the copy will not have the original's snap.

  Perhaps someone can fill us in on the math that applies to
the qualitative statements I made above. I knew them once
but have forgotten, unfortunately.

Greg Erker



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