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Re: [ATM] Another Astigmatism question, but at the sphere

To: "J Killea" <jkillea@yahoo.com>, <atm@atmlist.net>
Subject: Re: [ATM] Another Astigmatism question, but at the sphere
From: "Jeff Baldwin" <bald@olypen.com>
Date: Tue, 30 Aug 2005 21:25:33 -0700
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You may have a slightly spherical secondary mirror which would reflect light 
to the eyepiece with astigmatism.
JBald


> My most recent update on this thing is that my second star test session 
> last night revealed an elliptical asymmetry along the same direction that 
> my first set of star tests did, even though I had rotated the mirror 120 
> degrees after the first set.  So I'm pretty sure the problem is with the 
> diagonal.  Think I'll loosen up the sleeve around the diagonal just a tad. 
> Anyway, it's probably time to parabolize (for the third time!).


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References:
- Re: [ATM] Another Astigmatism question, but at the sphere
  - From: J Killea <jkillea@yahoo.com>

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