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Well its not necessarily a good thing. Is it possible to isolate the rattle. Is it possible to determine if the filter itself moves within the ring? It maybe a poor fitting filter within its frame.
At the end of the day, if it only rattles when you shake it but is perfectly fine when you put it in the focuser, then its probably going to be ok. Just check to make sure there are no obvious cracks around the edges.
Rod
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