While sunlight and UV lights will apparently help reduce or prevent future fungal growth and kill what's there, if it's only surface fungus and not etched into the glass and I can safely disassemble the unit without mixing the order of glass I have for many years used white vinegar on camera lenses and telescope lenses, rinsed very well with fresh distilled water after the vinegar wash. It has served me well for several years but in saying that my entire OTA's are probably worth less than that one Tac eyepiece.
I had a problem many years ago with a near new Nikon 80-200 f2.8 ED lens which I'd kept stored in it's leather canister type case. I had no idea the case was only for travel not storage, it was an expensive lens and was left in a slightly damp room. That went to a professional down in Rockdale, NSW (Peter someone, old Austrian fellow from memory and very smart) back in the early to mid 90s for a full strip and clean and by the grace of photography deities the fungus hadn't marked the lens with any etching, it's never happened again and the repair was far from cheap as was the lens (on my then wages) purchased new in 91
I am however grateful I don't live in a climate with monsoons and humidity I could only guess Vietnam has. I'm also a lot more careful with lens storage now..
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Originally Posted by Wilso
Some eyepieces and binoculars are nitrogen purged for waterproofing, to prevent moisture and dust from entering
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A question for those in the know, I've seen eyepieces listed as such but is it a process that has to be reapplied after some time as o-rings deteriorate or do they go in the bin and you buy new units?
Is this the same procedure applied to expensive APO lens assemblies or am I getting confused with oil which can eventually leak out?