The LOMO OKS1-50-1 (2/50) lens is a high-aperture six-element anastigmat. The objective lenses are chemically coated. The lens is designed for professional film cameras working on 35 mm film with a frame size of 16x22 mm.
Produced for cameras such as "Rodina", "Konvas-automatic", "Moscow", etc. High aperture and high resolving power allow the lens to be used for a variety of filming when creating feature films, documentaries, newsreels, sports and other films. The optical parts of the lens are mounted in a special frame. The frame has a thread that attaches the lens to the camera, and an aperture ring. The frame has an aperture scale.
The lens aperture is iris. The lens barrel can accommodate 36mm snap-on attachments. Outside the camera, the lens is protected by protective covers. Focal length, mm - 50.34.
Relative aperture - 1:2. Angular field of view, g - 30.
Working distance, mm - 46.46. Front focal length, mm - 17.86. Rear focal length, mm - 32.24. Light transmission coefficient - 0.75. In the center - 50.
Along the edge of the field - 25. Number of lenses - 6. Luminous diameter of the first surface, mm - 25.5. Luminous diameter of the last surface, mm - 20.7.Largest frame diameter, mm - 41. Frame length, mm - 48. Connecting thread - SpM 33x0.5. Smooth (diameter), mm - 36.