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Amazon.com : Fotasy M42 Lens to M4/3 Focusing Helicoid Adapter, MFT Mount Macro Helicoid Tube, Compatible with Panasonic G9 GH5 II GX8 GX9 GX850 G95 G100 Olympus E-M1 E-M5 E-M10 I II
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Amazon.com: Acouto Focusing Helicoid Adapter, M42‑M39 17‑31mm Camera Adjustable Focusing Helicoid Adapter Macro Extension Tube Lens Flash Adapters Converters Camera Accessories : Electronics
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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 :
Helicoid grease and oil condensation from that hitting sensors with old lenses, and new?: Sony Alpha Full Frame E-mount Talk Forum: Digital Photography Review
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Amazon.com : Fotasy M42 to M42 Lens Macro Helicoid Adapter, 42mm Focusing Helicoid Extention Tube, 15mm to 26mm, fits M42 Screw Mount Lens : Camera Lens Adapters : Electronics
A Warning to Those Who Are Using Helicoid Adapter: Adapted Lens Talk Forum: Digital Photography Review
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