----- Original Message -----
From: "Mike Vande Bunt" <Mike.VandeBunt@mixcom.com>
> The photos in the Dreamagon article in Shutterbug look quite a bit
> different from the majority of the samples on the web site. Many
> of the web sample images were shot a a higher f/ stop for a less
> "extreme' effect. It is when the lens is wide open (f/4) that the
> images are similar to zone plate.
The main difference (beside the price) I find is that de ZP has an effect
that is "radial" and the dreamagon is (hard to explain this) "linear". For
instance, if you were making the picture of a bright circular light source,
the ZP will show a ghostly halo all around the light source and the
greamagon -judging by the images in Shutterbug- would probably show a
elongated halo on top and perhaps at the bottom also, of circular light
source (in a horizontal composition).
BTW, taking about ZP, there is an article in that Shutterbug Feb/2001
edition about some Canon glass lenses using Diffractive Optics, the same
principle ZP lenses use. This new lenses (no yet released) use fresnel
lenses in combination with glass lenses.
Guillermo
Received on Thu Jan 18 07:47:15 2001
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