[LargeFormat] Zone Plates

[Les Newcomer]

Pinhole resource sells them for about $20 each. For that you will
recieve a 35mm frame of Tech Pan film with a zone plate in the middle
and a piece of brass shim stock.

Tape the film to the brass,tape the brass to an empty lensboard. done.
The instructions that come with the plate from Pinhole Resource gives
guidelines for subject/lightling, exposure & dev.

I couldn't find the sight that showed how to print out their target and
photograph it yourself, it's out  there somewhere.

Les

Douglas Cooper wrote:
> 
> >
> > At the other end of the spectrum is the zone plate.  From  "pinhole
> > Photographery Rediscovering a Historic Technique":
> >
> > A zone plate diffract light, consequently zone plates are closely
> > related to pinhole photography. Zone plate render soft-focus imgagery,
> > yet they are not like soft-focus lens imagery. The beauty within a zone
> > plate image is the recognizable halo or glow that surrounds any strong
> > contrast edge. this glow occurs becuase light rays are considerably bent
> > when hitting the edges of the opaque ring within the zone plate*.
> > Foliage such as green leaves under certain lighting conditions may
> > resemble infrared imagery.
> >
> > a zone plate is made of concentric rings about a clear aperture. (think
> > tiny target) The entire plate (hole) is usually less the 1/8" dia and
> > made of tech pan or lith film backed by a brass shim.
> >
> 
> Are these zone plates expensive?  And how do they attach?  (I still don't
> have much of a sense of where they fit on the lens/camera.)
> 
> 
> Douglas Cooper
> http://www.dysmedia.com
> 
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