1. Finally, we mention the catadioptric system of Schupmann's medial.

2. Catadioptric System, Aberration Measuring Apparatus, Method of Adjusting Optical System, Exposure Apparatus, and Device Manufacturing Method

3. These are used on catadioptric telescopes mentioned above and in any system that is required to work at 100% of its aperture (usually because the system is required to work at its maximal angular resolution).