zoneplates

Hi:

some quick questions for the zone plate experts. I did some work on the
weekend with a large pinhole camera and ortho film. The exposure time was
tedious. 1/2 hour for somewhat under-exposed negatives in direct afternoon
sun. I want to speed this up somehow.

How much faster does a zoneplate work than a pinhole on average?

I want to try making a zone plate for this and other cameras. I was going
to make the zone-plate on ortho film. I am wondering if its possible to
make one master zone plate image and project from an enlarger, this image
onto another sheet of ortho to scale it up or down make zoneplates for
diffferent focal lengths.

I guess this depends upon whether or not the zoneplate for different focal
lengths is proportional the same. Is it? Or is the ring relationship
unique for each focal length?

Is the "sharpness" of the zoneplate image governed by the number of rings?
How close can one get the resolution of an image created with an ideal
pinole diameter?

My other question is has anyone had success creating and outputing these
completely digitally -Is there a printer that can create a fine enough
resolution image to make good zoneplates?

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Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
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Received on Wed Nov 14 00:26:28 2001