Stereo slide viewer middle frame in which the stereo pair is mounted in a frame of 50x50 mm. For this viewer, the result should be cut first and then changed and mounted to avoid pseudo stereoscopic viewing. The viewfinder is optically in good condition. technically good viewer visualize, with little distortion. Plastic foil matte on the back. The visor is made of cast aluminum, black powder coated. Fixed focus lenses.
