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Re: ATM Effects of an inferior secondary

To: <atm@shore.net>
Subject: Re: ATM Effects of an inferior secondary
From: "Bill T." <twentiethwave@hotmail.com>
Date: Fri, 20 Jul 2001 10:52:46 -0600
References: <014a01c10fe3$dd302f80$2201a8c0@rcsis.com><000d01c11065$69f9bb80$d457510c@1cxkb> <3B575E76.FE01C11E@pacbell.net> <3B575F82.3FFAAB71@pacbell.net> <OE40NZStgLzhVOJwnzs0000084d@hotmail.com> <15NTob-0qUgroC@fwd04.sul.t-online.com>
Reply-To: "Bill T." <twentiethwave@hotmail.com>
Sender: owner-atm@shore.net


Hello Michael Koch,

Thanks for you observation that spherical on a secondary shows up as
astigmatism at the eyepiece, due the 45% surface angle.  That is very useful
basic information and explains puzzling effects I have seen through certain
scopes. The sqrt(2.0) "balance" between primary and secondary quality seems
quite logical.

BTW, that's a very impressive control system!

Bill T.

References:
- ATM 3.5" Secondary Sources?
  - From: "Jim Miller" <jim@jtmiller.com>
- Re: ATM 3.5" Secondary Sources?
  - From: "Herb Kasler" <h.kasler@worldnet.att.net>
- Re: ATM 3.5" Secondary Sources?
  - From: Bill Marriott <btk@pacbell.net>
- Re: ATM 3.5" Secondary Sources?
  - From: Bill Marriott <btk@pacbell.net>
- ATM Effects of an inferior secondary
  - From: "Bill T." <twentiethwave@hotmail.com>
- Re: ATM Effects of an inferior secondary
  - From: astro.electronic@t-online.de (Michael Koch)

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