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[ATM] star testing

To: "The Amateur Telescope Makers List" <atm@atmlist.net>
Subject: [ATM] star testing
From: "Jerry B. Hillman" <JBHillman@ev1.net>
Date: Sat, 22 May 2004 08:18:38 -0500
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Reply-To: "Jerry B. Hillman" <JBHillman@ev1.net>
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Hi all,
I have a 10" F7 that performs very well.  In a side by side star test
comparison, the 16.5"- F4.5  I am working on shows nearly duplicate images,
in fact a little better as the 10" has some astigmatism and the 16.5"
doesn't. Also the slight TDE in the 10" visible in the Ronchi testing is
absent in the 16.5".  Is there a flaw in the logic of comparing star test
images? These two scopes have nearly identical focal length.  (10" - 72" FL,
16.5" - 75.75 FL)
Clear skies, Jerry


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