From: David J. Romano (romano@agfa.com)
Date: 09/12/00-12:36:02 PM Z
I don't know anything specific, but the concept is right. So I would say that
it's not PR, it's real. I shudder to think of what one costs.
Dave
erobkin@uwc.edu wrote:
> I pulled the following stuff off the web. Those of you with an interest
> in some of the technical sides of photo lenses may find it worth looking at.
> It looks like the capability of lenses to capture information is taking
> another big step beyond the ability of the CCD/digital duo to record it.
>
> Anyone with additional information about any of this? Is it PR and not
> science?
>
> Eugene Robkin
>
> -------------------------------------
> Canon has announced development of the world's first 'Multi-layer
> Diffractive Optical Element'. A prototype Canon EF 400mm f4 DO IS USM
> lens incorporating this element will be exhibited at Photokina 2000
> (Cologne, 20 to 25 September). A commercial version is expected in the
> first half of 2001.
>
> By combining a Multi-Layer Diffractive Optical Element and a refractive
> optical element within the same optical system, chromatic aberration,
> which adversely affects image quality, can be corrected even more
> effectively than with a fluorite element. Also, through minute
> adjustments, the diffractive optical element makes possible the same
> optical characteristics as a ground and polished aspherical surface,
> which effectively corrects for spherical and other aberrations.
>
> Further details are available at
>
> www.canon.com/do-info/index.html
>
> ---------------------------------
>
> The following site describes some of the manufacturing techniques that
> may be involved in the Cannon design.
>
> http://www.takeuchi.mce.uec.ac.jp/papers/upmm/1999-08e/
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