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The Cyclop 85 mm f/ 1.5 (Russian: "Циклоп") is a fast medium telephoto prime lens for cameras with the m42 screw mount. The lens has no diaphragm.
In terms of image formation the lens is comparable to the Gelios-40, but its exact optical scheme remains unknown.
It was produced only as a part of the first star telescopes (NZT-1) at the Rostov Optical and Mechanical Plant.