Guillermo wrote:
Although I do not recommend focusing of the zoneplate every time you make an
exposure, I do recommend you focus it ONCE so you find out (if you wish) the
actual focal length of it. To do it, aim your camera to a light source
(light bulb for instance) or well illuminated object and focus on the aerial
image, rather than on the ground glass. You will be surprised how "good" is
the image a ZP produces. And yes, use a loupe.
Guillermo
What do you mean by "aerial image"
--
Chris Peregoy | http://www.gl.umbc.edu/~peregoy | http://imda.umbc.edu/
