From: Judy Seigel (jseigel@panix.com)
Date: 05/08/00-01:36:51 PM Z
On Mon, 8 May 2000 erobkin@uwc.edu wrote:
> If you shine a beam of light through a pinhole the image you get has
> alternating rings of dark and light because of interference phenomena. A
> zone plate is an idealized version of those images with the dark rings made
> completely opaque and the light rings as clear as possible. Because of
> interference actions light shining through the zone plate behaves like it is
> going through a pinhole but the amount of light is increased.
>
> Much detail and technical tradeoffs between pinholes and zone plates left
> out.
What I haven't seen mentioned is that the zone plate image is usually
quite distorted, an artistic softening and warping that can be very
beautiful, but not necessarily what one wants, or "working" with every
image.
Judy
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