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Proceedings Paper

Unobscured reflective zoom systems
Author(s): R. Barry Johnson
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Paper Abstract

All-reflective telescopes have found significant utilization in the astronomical community, government, and industry. Until recently, the concept of an all-reflective zoom telescope, particularly having an unobscured pupil, with meaningful capabilities was unknown. Several designs of unobscured-pupil zoom telescopes comprising only three mirrors are presented. The designs discussed have fields-of-view up to 3 degrees by 3 degrees, F/#s as low as 3 and zoom ratios of up to 4:1. The rms geometric blur diameter for one zoom telescope, having a 4:1 zooming range, was found to be 45 (mu) radians in the wide FOV condition (2 degrees by 2 degrees and F/4).

Paper Details

Date Published: 5 October 1995
PDF: 8 pages
Proc. SPIE 2539, Zoom Lenses, (5 October 1995); doi: 10.1117/12.222835
Show Author Affiliations
R. Barry Johnson, Optical E.T.C., Inc. (United States)


Published in SPIE Proceedings Vol. 2539:
Zoom Lenses
Allen Mann, Editor(s)

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