Re: [ATM] 7 inch spherical mirror

["David Harbour" <stainless_steel@suddenlink.net>]

I suspected as much, Richard.

Thanks; just wanted to have at least some hazy idea of what is going on. The 
entrance pupil to any system employing a paraboloidal primary (and also a 
Ritchey Chretien, as well as a Classical Cassegrain, and the ever popular 
Newtonian, is of course the primary). The entrance pupil to a Schmidt, is, 
on the other hand, at the aperture where the corrector lens is, or should be 
(lenseless Schmidt).

Does anyone know that Schmidt himself was reputed to have told someone that 
an attempt to figure a corrector plate for any faster system then f/2 by the 
vacuum method can, and usually will, break the plate?

R-101

----- Original Message ----- 
From: "Richard F.L.R. Snashall" <rflrs@rcn.com>
To: "ATM List" <atm@atmlist.net>
Sent: Monday, April 14, 2008 8:18 PM
Subject: Re: [ATM] 7 inch spherical mirror


> David Harbour wrote:
>> Is the stop the entrance pupil, and if it is, where is it located?
> Since there are no "optics" in front of it, the entrance
> pupil is located where the aperture stop is.  For the
> analysis I've been doing, that is at the very edge of the
> mirror, at its full diameter.
>
>
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