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Fantasea Line Bayonet Mount on M52 Housing MB3 (Female) 4072 B&H
AOI Quick Release System 01 Adapter 3 for Backscatter M52 Wide & UWL-400A Lens
Amazon.com : Fotasy 17-31mm M52 to M42 Lens Macro Helicoid Adapter, 52mm Focusing Helicoid Extention Tube, 17mm to 31mm, 14mm Max Movement, fits M52 52mm Screw Mount Lens : Camera Lens Adapters :
Walmeck 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