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M39 Lens to M42 Camera Adjustable Focusing Helicoid Ring Adapter 25-55mm Macro Extension Tube M39-M42 - AliExpress
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Amazon.com : Fotodiox Lens Mount Adapter, M39 to M42 (39mm - 42mm Thread) Adapter for Leica, Canon, Nikon, Carl Zeiss, Pentax, Leica : Camera Lens Adapters : Electronics
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