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I agree with what has been said. Better to get a better filter that will last and give you great views that to spend less and get one that is not as good. Astronomics seems to have a good following followed closely by Lumicon and Orion (which incidentally just released their own version of an OIII filter). Regarding Sirius Optics filters, most reviews I have read have noted their delicate nature. Most owners leave them screwed onto the ep to avoid damaging the coatings.
Darren
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