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How long do filters last?
Recently I inspected my 20 year old Lumicon Deep Sky filter to see that when held to the light, the coating has become somewhat powdery looking. Perhaps that is why I am getting some star halos on photos also. So I have replaced it with an Astronomik CLS and also looking at more from Baader.
What sort of life can I expect out of the Astronomik and Baader etc? Do some last longer than others?
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