In preparation for a trip to Iceland next month, I inspected my filters and discovered that both of my Hoya filters (a 10 stop and 6 stop ND) have weird specking and deterioration of the coatings. I had returned one filter a couple of years ago because I became all blotchy despite rarely being used and being stored securely in a filter pouch.
I’m wondering whether others have had problems with Hoya. I have a B+W filter (cpl) that has been stored in the same pouch, same conditions, and used marginally more often that has never had an issue (after 8 years of use).
Have you had Hoya coating failures?
Do you store filters in a pouch? Could off-gassing from the fabric create these issues?