This paper presented at (AMOS)
Advanced Maui Optical and Space Surveillance Technologies Conference 2006.
Two all-spherical catadioptric Gregorian telescope designs suitable for meter class telescopes are described.
Common to both designs are a group of small, conventional lenses placed at the intermediate focus of the
Gregorian system to correct the aberrations of the high-speed (f/1.5) spherical primary mirror and spherical
secondary mirror. In the first design, a classic Gregorian configuration, the secondary mirror amplifies the
focal length of the primary to yield a typical f/8 beam. A second configuration is illustrated that has the
secondary mirror reducing the primary’s focal length resulting in a higher-speed, (f/1) imaging system.
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