Re: 4x5 camera suggestions

[George L Smyth <GLSmyth@xxxxxxx>]

Vaughan Bromfield wrote:
> 
> At 2:54 PM 13/2/97, George L Smyth wrote:
> 
> >Zone plate photography involves the use of concentric circles which
> >cause diffraction, which focuses on the film plane.  The images are a
> >bit "fuzzier" than pinhole, though the speed is faster and "hot spots"
> >tend to glow.  That's the short answer.  Confused yet? <g>
> 
> You know, I've never heard of this or seen it before. Is it a DIY
> technology (like pinhole) or does ot require some specialised equipment?
> 
> Can anybody point me to some examples of this interesting work, especially
> on the WWW?

I do know of people making zone plates themselves, though I would think
that most would purchase them commercially.  An explanation of
diffraction can be found at
http://www.underware.com/imo/fresnel/fresnel.htm, although they are
talking about fresnel zone plates.  I've been thinking of getting a few
to play with, so in the not too distant future I'll do it.  It should
complement the pinhole images I have on my Web site.

Cheers -

george

-- 
 Handmade Photographic Images     
  http://www2.ari.net/glsmyth/

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End of INFRARED-PHOTOGRAPHY Digest 208
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