Re: Inexpensive Telescope Design Revealed

bratislav3162@xxxxxxxxxxx wrote: 
jsavard@xxxxxxxxx wrote:


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.



Have you ever made a Schmidt plate, Maksutov corrector or for that
matter ANY
optics yourself ?
From your webpage it seems that you haven't, but let's clear that. 

BTW your sense of "inexpensive" seems rather humorous. Full size ultra
thin menisk, another (thick) one, two mirrors ... Lots of work, lots of
expensive coatings, for what seems rather like abysmal correction.

Yep. Six surfaces plus coatings. Makes a 4 surface Super Schupmann seem almost trivial by comparison <G>

--
Jeff (STM)
.