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Weird concentric rings with PST and barlow.
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02-04-2012, 03:09 PM
Poita
(Peter)
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Join Date: Jun 2011
Location: NSW Country
Posts: 3,586
Might help if I attached a picture. One is defocussed to show the effect more clearly, the other image is without the Barlow in.
The barlow works without a hitch for planetary.
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