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DIO
super member
Reged: 11/12/04
Posts: 102
Loc: KY, USA
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Re: Orion 150mm MAK
07/29/05 07:26 PM
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Guys, I have already mentioned and solved this problem. I have an Orion 90mm Apex.
Master Pensack  has caught the root cause: The bright loop of light is eliminated if you put flocking paper in the inside of the tube - the small tube which goes through the primary mirror. It appears that this problem is very frequent in the Orion Maks. Nothing to do with the optics.
For those interested in the history of this, look under my name in a previous CAT thread - sorry I cannot post the link right now, but I don't have many entries at CN anyway, so it's easy.
Cheers,
Dimitri
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