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Source : https://www.techsyncweb.com/how-to-properly-care-for-your-helios-442-58mm-f2-a-comprehensive-guide/
the lens from humidity and fungus by using silica gel packets or a dry cabinet, as vintage optics are highly susceptible to moisture damage.The lens uses a unique two-step preset aperture mechanism that requires careful handling to avoid premature wear of the rings.If