Tiffen 77mm ND Filter Apex Series and Ugly stains

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TechMate New Member • Posts: 5
Tiffen 77mm ND Filter Apex Series and Ugly stains

Recently bought an ND 10 stop IR from Tiffen and i noticed some ugly stains on the coating which as much i tried to clean them they don't go away. they are in the coating shall i be worried ?

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