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Andoer M52-M42(17-31) 17mm-31mm M52 to M42 Mount Camera Lens Adapter Ring Macro Extension Tube Helicoid Lens Focusing Adapter Ring for Macro Photography - Walmart.com
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Focusing Ring Helicoid Copal #1 DIY 4x5 8x10 Large Format Camera Lens Adapter 614992508156 | eBay