The lens (8) has a detector lens (16), and a mirror lens (12) movable relative to the detector lens, where the mirror lens has a concave aspherical main mirror (18) and a convex aspherical secondary mirror (20). An optical joint (14) is provided in an area between the main and secondary mirrors for tracking an optical path on a detector during rolling-pitching-movement of the mirror lens. The detector lens has a set of lenses (50, 52, 54, 56) e.g. collective lens and divergent lens, for forming an object scene on the detector, where the lenses are movably relative to each other.
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