I'm going to try making some zoneplates. I've read about that zoneplates require focussing. None of my cameras pinhole cameras can focus. Is zoneplate focusing necessary in all cases? Is focusing needed only for subjects that are close to the camera?
Does it matter whether a positive or negative image of the zone plate is used? Does the center circle have to be opauque? Thanks Gord --------------------------------------------------------- Gordon J. Holtslander Dept. of Biology hol...@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 ---------------------------------------------------------
