Re: holographic plates

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From: Robert W. Schramm (schrammrus@hotmail.com)
Date: 08/14/00-08:08:17 AM Z

Jeffrey,

Yes, I know all that. White light holograms incorportate filters BTW.
The original holos were only viewable with laser light. I suspect the
glass plates mentioned in the original post were old and, therefore,
the old slow plates which were used for the original holographic images.

Bob Schramm

>From: "Jeffrey D. Mathias" <jeffrey.d.mathias@worldnet.att.net>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: holographic plates
>Date: Mon, 14 Aug 2000 07:14:49 -0400
>
>"Robert W. Schramm" wrote:
> > The holographic "image" is not an image at all but a series of
> > interference patterns which are used to "construct" the image in space
> > via laser light which is monochromatic and coherent. ...
>
>For years (decades) holographic images could be made that are viewed
>with a regular tungsten lamp which is neither monochromatic nor
>coherent.
>
> > ... In order to avoide
> > distortion the backing is non flexable glass. This will give
> > the best image. ...
>
>The optical glass plate will give the highest resolution image, but
>decent holograms can be and are made on films as well.
>
> > ... The plates are sensitive to red laser light and fairly slow. They
> > are also rather expensive. ...
>
>Some holographic film is fast enough to easily use humans as subjects.
>Remember some of the classics like the blowing kiss. They can also be
>in color, recall the National Geographic space shot with the McDonalds
>add on the reverse.
>
>--
>Jeffrey D. Mathias
>http://home.att.net/~jeffrey.d.mathias/

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