Re: Zone Plate Focus stringency

----- Original Message -----
From: Chris Peregoy <peregoy@gl.umbc.edu>
To: <pinhole-discussion@pinhole.com>
Sent: Monday, October 29, 2001 12:14 PM
Subject: Re: [pinhole-discussion] Zone Plate Focus stringency

> 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"

That was going to be my question.
Received on Mon Oct 29 16:38:25 2001