The utility model relates to optical instrumentation, particularly to an optical surveillance systems, measurement of distance to a remote object and targeting different weapons.; Stated day-night sight having a small light losses, high optical resolution performance night sight and optimal weight, dimensions, it consists of three modules having standardized connection node. In case the first set of modules sequentially luminous flux turning system, the aiming element and the eyepiece, the front end part of the first module housing, opposite the eyepiece, configured with a receiving element module component compound. The second module is made removable for observation during the day and the day channel comprises a lens, said lens opposite output portion of the second module housing is provided with a return element for connection to said receiving element module component compound. The opposite end portion of the third lens unit, which is a removable module for observation during the night, also provided with a return element for connection to said receiving element module component compound.
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