> I ran into this the other day, and thought list members might find it
> interesting.
>
> <A HREF="http://www.qualitycamera.com/zone%20plate%20.htm">Untitled Document
> </A>
> Kurt Norlin
Their introduction says a zone plate has infinite depth of field.
That's wrong. Unlike a pinhole, a zone plate does focus light
and has the same depth of field as a lens of similar focal length
and f number.
Received on Sun Mar 11 19:56:45 2001
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