M39 (39x1mm) - M42 (42x1mm) Screw Thread adapter ring for converting a M39x1 lens to a M42x1 lens for Jupiter Zenit M39 lens etc

M39 (39x1mm) - M42 (42x1mm) Screw Thread adapter ring for converting a M39x1 lens to a M42x1 lens for Jupiter Zenit M39 lens etc

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