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Hi CometC
I have a Lumicon Deep Sky filter as well, which is around 25 years old or more. Apart from some minor dust and grime, I see no evidence of 'powdery' deterioration at all. I would have thought they last a lifetime, barring some mishap or abuse. PS, admittedly I dont know much about filters, and maybe there could be batch to batch variation. Fox.
Last edited by Fox; 09-10-2012 at 05:57 AM.
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