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no concentric circles in star test
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September 23rd 07, 09:25 PM posted to sci.astro.amateur
brucegooglegroups
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no concentric circles in star test
If a star test does not show any concentric circles, but the donut
hole is in the center- what does indicate about the collimation of a
Newtonian?
Thanks.
Bruce
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no concentric circles in star test