Abstract

This paper describes an easily fabricated telescope which forms a high quality image of an extremely wide angle object field on a flat image surface. The telescope uses only reflectors, and thus has no chromatic aberrations. An eccentric portion of the symmetrical field of the telescope is used, such that no part of the aperture is obscured. The mirrors are surfaces of revolution described exclusively as flats, spheres or conic sections, all of which are easily tested and verified in manufacture using well-known, conventional null tests. Each mirror shares a common axis, facilitating telescope alignment. One mirror is used twice, providing the function of a secondary and tertiary mirror, while eliminating the need to align a separate tertiary mirror.

© 1990 Optical Society of America