Patent ID: 7224520

Claim:
A catadioptric imager comprising: a first group of optical elements optically disposed to receive electromagnetic radiation from a source; said first group of optical elements comprising at least one refractive optical element and having positive optical power; a second group of optical elements having at least one optical surface; said second group of optical elements being optically disposed between said first group of optical elements and an image plane; the at least one optical surface of said second group of optical elements being a reflective surface; said second group of optical elements having positive optical power; a third group of optical elements having at least one optical surface; said third group of optical elements being substantially centered with respect to said first group of optical elements and optically disposed between the object and said second group of optical elements; the at least one optical surface of said third group of optical elements being a reflective surface; said third group of optical elements having negative optical power; a fourth group of optical elements substantially centered with respect to said second group of optical elements; said fourth group of optical elements comprising at least one refractive optical element and having negative optical power; and, a fifth group of optical elements having positive optical power; said fifth group of optical elements comprising at least one refractive optical element; said fifth group of optical elements being optically disposed between said fourth group of optical elements and the image plane; said fourth group of optical elements being optically disposed between said third group of optical elements and said fifth group of optical elements.