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Re: [ATM] Re: Another Astigmatism question, but at the sphere stage
Forgot to mention that the secondary can also make for
astigmatism as a non-flat surface will do the job quite nicely.
You can detect which surface is causing the problem by rotating
the primary and the EP to see if either of them cause a rotation
of the direction of the astigmatism.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net
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