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Re: [ATM] Re: Another Astigmatism question, but at the sphere stage
One thing to note is that the astigmatiam test for a mirror needs
to be done at the chenter of the optical axis, especially that of
the EP. EPs can have massive amounts of astigmatism at the edge
of the lens so any test for astigmatism can only be done when the
star is centered on the center of the EP.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net
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