FIELD: optics. SUBSTANCE: invention can find use in optoelectronics, for instance in infra-red imagers. Radiation flux from sufficiently distance object goes in process of movement of device to receiver 2 along two parallel branches 1-6-2/3-4-1-5-1-6-2 through elements forming two images of source superimposed on each other. EFFECT: improved operational efficiency of optical system. 2 cl, 1 dwg
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