The present disclosure relates to a passively athermalized reimager. The reimager comprises a mirror objective module and a relay optics module optically coupled with the mirror objective module. The mirror objective module comprises at least a first mirror and a second mirror. The first mirror receives input radiation reflected from an object and the second mirror focuses the input radiation reflected from the first mirror onto a first focal plane. The relay optics module comprises at least four lenses for relaying and reimaging the input radiation from the first focal plane on to a second focal plane. The second focal plane is coincident with a focal plane array detector where the input radiation is reimaged for object identification. The reimager is housed within a protective housing and is athermalized for a predetermined operating temperatures so that no defocussing occurs when the operating temperature changes.
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