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Fotasy M42 to M42 Lens Macro Helicoid Adapter, 42mm Focusing Helicoid Extention Tube, 15mm to 26mm, fits M42 Screw Mount Lens - HC1526
Fotasy HC1526
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UPC
081159145866
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Made of light-weight aluminum alloy Male thread: 42mm. female thread: 42mm The Length of this Helicoid Tube 15mm(Min), 26mm(Max), it offers a total of 11mm Movement Distance for Lens Focusing. "Work with M42 screw mount lenses, such as Carl Zeiss, Pentax takumer lens. If you want to use 39mm enlarger lens with this focusing helicoid, you need an additional 39mm-42mm Adapter. " Every useful for lenses without focus ring. It could be used as macro barrel, and offers fine focus control for macro photography.
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