Re: Inexpensive Telescope Design Revealed
- From: jsavard@xxxxxxxxx
- Date: 14 Nov 2005 12:17:06 -0800
nytecam wrote:
>Thanks John - interesting webpage. Could you identify this design more
>precisely for me as I seem lost in the many options;-).
It's the only one for which a detailed prescription is given, quite a
ways down the page.
> Regarding forming aspheric corrector plates I thought the plane plate
> was vacuum deformed against a metal former and ground/figured flat to
> form the required profile when the vacuum was released??
I've seen that claimed, however it doesn't quite seem to make sense.
Thus, I think that it instead is ground *spherical* to form the
required profile. Which I've also seen written somewhere.
>You refer on your page to a vacuum induced plate
> glass as spherical - admittedly glass is [on the short time scale]
> rigid.
If the vacuum made the glass spherical - instead of a more 'pointy'
shape - then vacuum forming would, of course, be irrelevant to the
manufacture of Schmidt correctors.
John Savard
.
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