FIELD: optics, engineering of infrared devices.
SUBSTANCE: projecting objective contains two groups of single lenses, between which at an angle of 45 degrees to optical axis deflecting mirror is positioned. First group consists of negative meniscus, and second group - of two positive lenses, the last one of which - meniscus, directed by concave portion towards the object. Negative meniscus in first group is directed by concave portion towards the object, while first positive lens of second group - meniscus, directed by concave portion to object and its concave portion is made aspheric. Objective has zooming close to minus one, external input pupil and small dimensions of optical system with good quality of image of point on axis and by field.
EFFECT: increased efficiency.
3 dwg
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