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Lens Bubbles: Using a Focusing Helicoid as a Lens Adapter
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Lens Bubbles: Using Enlarging Lenses with a Focusing Helicoid on Sony NEX
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/product/41/7250151/2.jpg?2655 "Generic M52 Lens To M42 Camera Adjustable Focusing Helicoid Ring 36 | Jumia Nigeria")
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malykh.com notes: Noname Leica M-Sony FE/E close focus (helicoid) adapter
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43 | Ready for the focus ring/helicoid to be refitted | in2classics | Flickr
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Lens Repair (5): Helicoids – My Take on Photography (Lens Repairs Mostly)
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