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Chroma Cameras unveils new 24mm lens for Leica M39 screw mount that weighs only 16g: Digital Photography Review
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M42 Screw Mount SLR Lens to Canon EOS Mount SLR Camera Body Adapter – Fotodiox, Inc. USA
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M42 lens mount - Wikipedia
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Fotodiox Lens Mount Adapter Compatible with M42 Type 1 Screw Mount SLR – Fotodiox, Inc. USA
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M39 lens mount - Wikipedia
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