From: Robert W. Schramm (schrammrus@hotmail.com)
Date: 09/12/00-08:43:16 PM Z
Astrophysicists regulaly use CCD arrays of enormous size in place of
film and have been doing so for some time. In use they are cooled
with liquid nitrogen, I believe. I do not know the size but they must
be big if they are replacing film for astronomical use. I suspect
they are also enormously expensive. All you need is a research grant.
Bob Schramm
>From: ken Watson <watsok@frii.com>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: RE: Advances in CCD to go with Canon
>Date: Tue, 12 Sep 2000 13:38:37 -0500
>
>I believe Japan is forbidden to sell a CCD sensor in excess of 4M pixels,
>national security issue. I have heard that KODAK has a 5 Million pixel
>design that they are putting on the merchant market and for internal use.
>These are the largest sensors I have read about lately.
>
>..-----Original Message-----
>..From: erobkin@uwc.edu [mailto:erobkin@uwc.edu]
>..Sent: Tuesday, September 12, 2000 2:14 PM
>..To: alt-photo-process-l@skyway.usask.ca
>..Subject: Advances in CCD to go with Canon
>..
>..
>..Since posting the message about the Canon lens I heard a news story that
>..said someone
>..had developed a CCD with resolution so that "a 4 ft by 8 ft enlargement
>..showed no pixilization or artifacts" Now that may be from interpolation
>..and smoothing and have only pr meaning or it may be real. Anyone hear
>..about this? If that is a CCD of a size to fit in a 35 mm SLR style body
>..then the Canon lens idea coupled with that much resolution would be
>..a revolution indeed. If I see any followups on it I'll post them here.
>..
>..Eugene Robkin
>..
>..-----Original Message-----
>..From: alt-photo-process-error@skyway.usask.ca
>..[mailto:alt-photo-process-error@skyway.usask.ca]
>..Sent: Tuesday, September 12, 2000 12:36 PM
>..To: alt-photo-process-l@skyway.usask.ca
>..Subject: Re: Advances in lens design
>..
>..
>..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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