The need for a light weight, compact optical system with a large field of view (FOV), high resolution over a large spectral bandwidth, and flat image plane has prompted the design of a three mirror anastigmat (TMA) with the following properties: it is off axis in aperture and field, is unobscured, and is entirely reflective. Precursor designs based on the Schmidt and Schwarzschild principles of correction are discussed and several variations of the TMA design are introduced.
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