A wide field of view telescope having two concave and two convex
reflective surfaces, each with an aspheric surface contour, has a flat
focal plane array. Each of the primary, secondary, tertiary, and
quaternary reflective surfaces are rotationally symmetric about the
optical axis. The combination of the reflective surfaces results in a
wide field of view in the range of approximately 3.8.degree. to
approximately 6.5.degree.. The length of the telescope along the optical
axis is approximately equal to or less than the diameter of the largest
of the reflective surfaces.