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Re: [ATM] Cassegrain vs. Gregorian

To: "atmlist" <atm@atmlist.net>
Subject: Re: [ATM] Cassegrain vs. Gregorian
From: "Bob May" <bobmay@nethere.com>
Date: Tue, 24 Aug 2004 22:52:02 -0700
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Personally, I'd rather build a concave secondary with an e of about half a
parabola than build a convex secondary with a hyperbolic e of about 4 times
that of a parabola.
Concave surfaces I can test with a Foucault tester while a convex surface
needs a large spherical mirror to test.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net


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Follow-Ups:
- Re: [ATM] Cassegrain vs. Gregorian
  - From: "Richard F.L.R. Snashall" <rflrs@rcn.com>

References:
- [ATM] Cassegrain vs. Gregorian
  - From: "Richard F.L.R. Snashall" <rflrs@rcn.com>

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