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Hi, I just published a video of how I am cleaning my filters - I thought I might do this while my telescope is back at service due to some kind of astigmatism.
How do you guys clean your filters? it seems that every dust particle finds it way to the filters just as you are done cleaning them, and to sit in a damp bathroom seems kind of a mess...
Anyway, here is the video
By inFINNity Deck
As I have replaced them with new-style versions, I have two old-style ZWO 36mm unmounted narrowband filters for sale:
They are pre-2018, so with both sides silver instead of yellow&purple, and come in the original, but opened, packaging. Condition like new.
Attached images have been made with them. Any decent price will do.