Lens, Som Berthiot, Eidoscope n°3
This lens, previously manufactured by Hermagis has a maximum aperture of f/4.5 and a focal length of F=275mm. Aperture is changed thanks to a ring which goes from f/4.5 to f/20. Lens diameter is 6cm accross. The serial printed on the lens barrel is 762115. Paris post-1934, date at which Som Berthiot took over production. No fungus, no haze, no separation, no scratches.