Carl Zeiss Jena CF-250 Fototubus Jenamed / Jenaval microscope Bertrand lens | internal mechanism with knob - Video 1

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Carl Zeiss Jena CF-250 Fototubus - Jenamed / Jenaval microscope Bertrand lens | internal mechanism with knob

Video 1 – Carl Zeiss Jena CF-250 Fototubus - Jenamed / Jenaval microscope Bertrand lens | internal mechanism with knob