Lens adapter ring for RMS microscope lens to M42 Pentax screw mount camera

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This is aluminum made adapter lens adapter ring for Royal Microscopical Society (RMS) lens on M42 screw mount (42mm x 1.0) camera.Suitable for RMS microscope lens.Options: 20mm, 25 mm . Inside Thread: RMS (20mm) / RMS (25mm)Outside Thread: 42mm X1mm After addition, you can also use it on M42 lens adapters, e.g. M42-EOS, M42-Nikon, M42-Sony, etc. Show more