BG 4x50 binoculars for the Red Army, 1932

An original and very rare pair of binoculars in satisfactory condition, but quite suitable for subsequent restoration. The optics are dirty and need cleaning. The binoculars are built according to the Galileo optical scheme (convex lens and concave eyepiece). Unlike prism systems, the Galileo scheme provides a direct image without the use of prisms, which minimizes light loss inside the device. The 12.5 mm exit pupil exceeds the capabilities of the human eye in the dark (maximum 7-8 mm). This ensures that even with heavy rolling on the ship, the observer's eye did not "lose" the light beam. The small multiplicity (4x) completely leveled the shaking of the hands, allowing comfortable panoramic observation on the move or from the deck of the ship. Guarantee of authenticity.

The BG 4x50 binoculars are rare Soviet high—resolution binoculars produced in the 1930s for the needs of the Navy and the Red Army command staff.  The production of BG 4x50 binoculars (Galileevsky binoculars) began in 1930 at the Leningrad Optical and Mechanical Plant (LOMZ) and lasted until 1934.  The device was created by order of the People's Commissariat of Defense as marine night binoculars. Due to the Galileo scheme and the huge exit pupil, it provided maximum brightness of the picture in deep twilight and at night, which was critically important for signalmen, naval watch officers and navigators. In 1934, production was curtailed in favor of classic prism devices. However, in 1941-1943, the concept was urgently revived: factory No. 353 (IZOS), evacuated to Tomsk, produced similar simplified binoculars labeled 4x45, and then ZOMZ produced them until 1945. In the post-war period, the BG 4x50 became the base for the creation of the famous Soviet theater binoculars, but in civilian version.