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Re: [ATM] Star teting a Cassegrain system and DeterminingSecondaryCorrection

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Subject: Re: [ATM] Star teting a Cassegrain system and DeterminingSecondaryCorrection
From: "Bob May" <bobmay@nethere.com>
Date: Wed, 8 Dec 2004 17:03:10 -0800
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Get yourself a Ronchi grating and use that to test for the shape of the
secondary.  You will find that it is a lot more indictative of the shape of
the secondary.  A perfect secondary will show straight lines.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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