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Adapters for connecting M39 & M42 lenses to a Micro 4/3 camera: Adapted Lens Talk Forum: Digital Photography Review
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Amazon.com : Fotodiox Lens Mount Adapter, M39 to M42 (39mm - 42mm Thread) Adapter for Leica, Canon, Nikon, Carl Zeiss, Pentax, Leica : Camera Lens Adapters : Electronics
Schneider T2 to Leica Screw Mount (M39) Adapter 21-080103 B&H
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M39 to M42 Screw Mount Adapter Ring for Leica L39 LTM LSM Lens to Pentax M39 -M42 | eBay
Macro Adapters for Schneider Lenses | Custom Photo Tools
Adapter for Zeiss Pentax M42 Screw Mount Lens on Leica M39 L39 Camera | KIPON
FotodioX Lens Mount Adapter for M39-Mount Lens to M39-M42 B&H
m42-m39 10-15 M42 to M39/L39 Mount Adjustable Focusing Helicoid Ring Adapter 10mm-15mm Macro Extension Tube
Any tip to remove a stuck m39 to m42 adapter ring : r/AnalogRepair
