Re: [ATM] Constraints on design

["David Harbour" <scarab2@cox.net>]

Richard,

Very familiar with the wonderful idea of the relay Cassegrain reflector.
Have been corresponding with another list member about the Gregorian
compound telescope- it is also, essentially, a "relay" telescope, but one
that does not have to use lenses. It relays the image, formed in the empty
space inside the tube between mirrors ("aerial image") back to the the focal
plane, right side up, and "correct"- not mirror reversed. Celestron offered
a 60 mm "corrected" (corrector plate) Gregorian spotting scope years ago. I
don't think to many were interested; you can see one in the film "Water
World", produced, directed, and starring Kevin Costner.

Dave

----- Original Message ----- 
From: "Richard F.L.R. Snashall" <rflrs@rcn.com>
To: "David Harbour" <scarab2@cox.net>
Sent: Monday, May 02, 2005 4:24 PM
Subject: Re: [ATM] Constraints on design


> David Harbour wrote:
>
> >Matt, Richard-
> >
> >I have been following this thread a while, and it seems that I have seen
> >this design under another name; only thing is, it (the name) will not
come
> >to me. I will sleep on it a couple of nights, and maybe it will. I saw it
in
> >one of those issues of Sky and Telescope that tried to KILL ME by
dragging
> >me so low over the power lines at Eagle's Nest airport when I took off on
> >one magneto.
> >
> >
> Found a reference for a "relay" telescope (which this isn't, though) for
> Nov. '77 (Dilworth)...
>


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