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HowTo: Checking the Optics on your GSO Dob
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30-05-2005, 11:47 AM
Starkler
(Geoff)
4000 post club member
Join Date: Sep 2004
Location: Melbourne
Posts: 4,900
If it looks like a big fuzzy donut you have de-focused too far.
At closer to focus you should see a series of rings bright and dark.
Starkler
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