Lens Zenit Helios-44 Helios 44 58mm 58 mm 1:2 - M42 connection. Lens Zenit Helios 44M-4 58mm f/2 - M42 Mount. Zenit Helios-44-2 Helios 44-2 58Mm 1:2 - M42 Connection. Zenit Helios-44M-5 Helios 44M 5 2/58 1:2 58Mm 58 Mm - M42.
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