FIELD: optoelectronic engineering; night-viewing devices. SUBSTANCE: Objective has four components first one being, essentially, positive meniscus lens with its concave side facing the image; optical intensity of last component, air gaps, and focal length of objective are interrelated. Optical components can be made of optical glass of same grade. EFFECT: provision for correcting chromatic aberration within desired spectral range. 4 dwg , 1 tbl
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