Original, Soviet Union, USSR, Russia, 1965. Flat collecting lens in a metal case. A distinctive feature of a collecting lens is the ability to collect rays falling on its surface at one point located on the other side of the lens. Focal length: 206 mm. Diameter: 55 mm. Weight: 160 grams. It is of great practical and collectible interest! No damage. Condition: very good. Original photo. You buy what is shown in the photo. Item code: ZLN.0.20.100