MIR -1B - interchangeable wide-aperture lens. Equipped with an iris diaphragm with a device for its pre-installation. Enlightened optics. Optical design based on Carl Zeiss Jena Flektogon 35mmf / 2.8 lens.
Specifications: Optical scheme: 6 elements in 5 groups Format: 35mm mirror Type: Constant focal length (fixed) Focus: Manual Focus Number of diaphragm blades: 13 Focal length: 37mm Aperture: f / 2.8-f / 16 Length: 62mm Weight: 240 g System: M42 Diameter of the front filter: 49mm Product condition. Excellent condition. Lenses clean without scratches, fungus and dust. The mechanics are working properly.