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Re: [ATM] Meade 'Fesses up

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Subject: Re: [ATM] Meade 'Fesses up
From: "vladimir sacek" <vlad@copper.net>
Date: Thu, 3 Feb 2005 08:25:03 -0500
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John,

> You are right, classical Cassegrain does have parabolic primary, and its 
> secondary has to have negative conic as determined by -(m+1)/(m-1) in 
> order not contribute any spherical aberration ("m" is secondary 
> magnification).


Make it -[(m+1)/(m-1)]^2. If I ever become famous of anything, it will be my 
typos...

Vlad 


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