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Old 02-04-2012, 02:00 PM
Poita (Peter)
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Poita is offline
Join Date: Jun 2011
Location: NSW Country
Posts: 3,585
Weird concentric rings with PST and barlow.

If I attempt to use a Barlow with the PST and a DMK21 camera, get these weird concentric rings. Is there any way to be rid of them?
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