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Assuming there is no huge visible fungus, inside, how to verify whether the second hand lens is affected by spores?
It is said that spores don't die and fungus may regrow. Also it is said that if we keep fresh lens with infected lens, fungus will spread.
Assuming it has tiny fungus, will it still spread if I keep it in hygienic conditions?
How to verify whether the invisible/removed fungus in the second hand lens is dangerous?
What are the signs that the white particles inside the lens are just dust and not fungus?
Basically I want to understand how to identify fungus when it doesn't look very obvious.