I had an old camera lens that had partial fungus growth on it and i ended up throwing it away after attempting to fix it. Fungus secretes acids which eat through coatings and etch the glass.
Keep that EP away from your other EP's. If you live in a humid climate, i suggest storing your optics in a powered dry box/cabinet.
Explore scientific sells waterproof nitrogen/argon purged EP's which prevents fungus growth.
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