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Source : https://www.techsyncweb.com/how-to-properly-care-for-your-helios-442-58mm-f2-a-comprehensive-guide/
solutions: protecting your lens from environmental damageHumidity is the enemy of any vintage lens, and the Helios 44-2 is no exception, as internal fungus growth can permanently ruin optical clarity if the lens is left in damp conditions for extended periods.
That kind of longevity says a great deal about how well the sensor and processor were engineered to begin with, and it's part of why DPReview handed the A6000 a Gold Award upon release.Aps-c