FIELD: physics.
SUBSTANCE: optical system consists of the input object lens sequentially arranged along the optical axis, forming an intermediate image and including the first positive, the second negative and the third positive convex-concave lenses of the projection object lens comprising the first bi-convex, the second negative concavo-convex and the third positive convexo-concave lens, and the photodetector with a cooled diaphragm.
EFFECT: improving the quality of the system image in the entire view field maintaining the size and reducing weight.
2 dwg, 2 tbl
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