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I assume when you took the corrector off you cleaned the secondary? The photos were taken with a clean secondary ? If the corrector is not in the correct position the telescope will not perform very well , this might be your problem not the reducer? Lubricant getting on the mirrors is reputed to be a problem with some c9.25" made in china in recent years. I have not left my scope pointing down as a precaution .
Regards philip
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