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Amazon.com : (5 Packs) Fotasy Lens Rear Caps for M42 42mm Screw Mount Lens, M42 Lens Cap, M42 Lens Rear Cap, 42mm Screw Mount Lens Cap, M42 End Cap, fits Pentax Takumar/MamiyaSekor/Helios
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Old Prime Lens With Classic M42 Mount On A White Background The M42 Lens Mount Is A Screw Thread Mounting Standard For Attaching Lenses To 35 Mm Cameras, Primarily Single-lens Reflex Models
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